Free Tools
Everything We Built, In One Place
Everything we built is here: the free tools we use on our own builds, gathered in one place. Each of them does its work on your own device. That means no installer, no sign-up form and no bill. Pick a tool below and start straight away.
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Free Tools You Can Open Right Now
These eighty-nine are finished and working today. Each one starts instantly, and only the paste bin opens in a new tab.
SEO and search
Everything that decides how a page is crawled, indexed and shown on a result.
Robots.txt Generator
Build a valid robots.txt from rows instead of memory. Presets cover a blog, a shop and a staging site.
Open tool →Robots.txt Validator
Paste a robots.txt and read about twenty checks on it. Then read errors, warnings and the reason for each.
Open tool →XML Sitemap Generator
Feed in your URLs and get a sitemap that passes validation. Repeats go, and tracking parameters come off.
Open tool →Hreflang Tag Generator
Write one block for every language version. Self-references and x-default are handled for you.
Open tool →Canonical Tag Generator
Clean a list of addresses, then write one tag per line. Tracking, fragments and www all sorted.
Open tool →Schema Markup Generator
Fill in fields and get valid JSON-LD. FAQ, article, product and local business are covered.
Open tool →Meta Tag Generator
Title, description, canonical and robots for one page, measured in pixels as you type.
Open tool →Meta Tag Analyzer
Read the head of any live page: title, description, canonical, robots and social tags, with the gaps named.
Open tool →Meta Description Writer
Nine description shapes from what you type, each measured in pixels, with a live result preview.
Open tool →SERP Snippet Preview
See where a search result cuts your title and description, on desktop and on mobile.
Open tool →Denwix Checker for Title and Meta Description Lengths
Check a whole list of titles and descriptions in pixels, and export the verdicts as CSV.
Open tool →Heading Tag Analyzer
Draw the H1 to H6 outline of a page or pasted markup, with skipped levels and empty headings marked.
Open tool →Image Alt Text Checker
A verdict on every image of a page, so missing, empty, file-name and generic alt text each arrive with the fix.
Open tool →Keyword Density Checker
See which words a page leans on, and how often. Reads one word, two words or three at a time.
Open tool →Keyword Combiner
Blend up to three keyword lists into every pairing. Meanwhile match types, duplicate removal and CSV export are built in.
Open tool →LSI Keyword Generator
Related keywords and questions from four search engines, in nine languages.
Open tool →Open Graph Generator
Build the four og: tags that shape your link preview on social apps.
Open tool →Twitter Card Generator
Card tags for a posted link, with the og: tags they fall back to.
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Links and redirects
Build an address, take one apart, or work out where a chain of them ends.
URL Parser
Split an address into scheme, host, port, path, query and fragment, with tracking parameters marked.
Open tool →URL Encoder and Decoder
Percent-encode one value or a whole address, and decode either, with the two scopes kept apart.
Open tool →UTM Link Builder
Campaign links your analytics can group: lowercase naming, hyphens, and old utm values stripped first.
Open tool →Slug Generator
Shape any headline into a tidy, readable URL. Accents flatten, stop words go, and nothing breaks.
Open tool →Shortlink Generator
Swap a lengthy URL for a tidy Denwix short link. Then share it in a post, an email or a printed flyer.
Open tool →Bulk URL Opener
Open a whole list of addresses in tabs at once, with repeats skipped and no extension to install.
Open tool →Link Extractor
Read every link on a page with its anchor text and rel value, filter the list, and export it as CSV.
Open tool →URL Cleaner
Strip UTM tags, ad click ids and redirect wrappers from any link, one at a time or a whole list.
Open tool →Link Wrapper Remover
Unwrap a Facebook shim, a YouTube redirect, an AMP page or a cache link and read the real address inside.
Open tool →Anchor Text Generator
Build one link with the right rel value, a safe new tab, and a check on the text itself.
Open tool →Backlink Maker
One link written six ways: HTML, Markdown, BBCode, plain text and an image link, each with a copy button.
Open tool →www and Non-www Redirect Generator
Send every version of your domain to one host and one scheme, in a single hop, for Apache or Nginx.
Open tool →.htaccess Redirect Generator
Write 301 or 302 rules without the syntax fight. Force https and settle www in the same block.
Open tool →Redirect Chain Checker
Follow every hop between one address and the last page. Loops and downgrades get named outright.
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Site and server checks
The questions you ask when a site is misbehaving and you do not know why.
SSL Checker
Read a live certificate: expiry, days left, name cover and whether browsers actually trust it.
Open tool →Domain Age Checker
Read the registration date, the expiry and the registrar for any domain. In other words, straight from the registry.
Open tool →DNS Records Checker
A, AAAA, CNAME, MX, TXT, NS and SOA read live, each with its TTL in plain words.
Open tool →Website Hosting Checker
Find who hosts any site, plus its CDN, server, SSL and domain age.
Open tool →HTTP Status Code Checker
Read the real reply headers for any address. Fifteen common codes come with a plain explanation.
Open tool →HTTP Header Checker
Eight security headers, compression and caching graded, and then the lines that fix them for your server.
Open tool →IP Subnet Calculator
Network, broadcast, usable hosts and both masks for any IPv4 or IPv6 range, plus a split into smaller subnets.
Open tool →What Is My IP
Your public address and its reverse DNS name, together with everything your browser tells the sites you visit.
Open tool →DMARC and SPF Record Generator
Tick your mail services and pick a policy; both records are built and checked for the mistakes that break email.
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Text and writing
Count it, read it, compare it or clean it up, all inside your own browser.
Word Counter
Tallies for words, letters, sentences and minutes of reading, refreshed on every keystroke. In addition, keyword counts come with it.
Open tool →Word Frequency Counter
Rank every word by how often it appears, then read the letter table that came out of the same paste. Also counts an exact phrase.
Open tool →Sentence Counter
Sentences, paragraphs and the spread of your sentence lengths. Abbreviations stay whole.
Open tool →Readability Score Checker
Flesch Reading Ease and four more formulas on your text, with the long sentences listed for you.
Open tool →Case Converter
Switch text between upper, lower, title, sentence and alternating case without retyping it.
Open tool →Duplicate Line Remover
Strip repeated rows out of a list and keep your original order. Sorting stays your choice.
Open tool →Reverse Text Generator
Backwards, mirrored and upside-down text in six modes, with emoji and accents kept intact.
Open tool →Random Word Generator
Draw nouns, verbs, adjectives or adverbs by length and first letter, for prompts and names.
Open tool →Small Text Generator
Small caps, superscript, circled and boxed letters as plain text you can paste anywhere.
Open tool →Lorem Ipsum Generator
Make placeholder paragraphs, sentences, words or list items. Also, pick classic Latin or plain English.
Open tool →Diff Checker
Set two texts side by side, line by line or word by word, and spot each change.
Open tool →HTML Tag Stripper
Pull the plain text out of markup, and keep the paragraph breaks the tags were holding.
Open tool →Denwix HTML Entity Encoder plus Decoder
Text to named, decimal or hexadecimal entities, and back again without guessing.
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Images and media
Convert a picture, shrink it, or work out what size it should have been.
Free Image Hosting
Upload a picture and get a direct link, plus HTML and Markdown code.
Open tool →Image Converter
Reads PNG, JPG, WebP, AVIF, GIF, BMP and SVG, and writes PNG, JPG or WebP. Also, all of it stays on one page.
Open tool →PNG to WebP Converter
Convert a batch of images to a lighter format. Also takes JPEG, GIF and BMP, and keeps transparency.
Open tool →SVG Compressor
Shrink SVG files or pasted code, and strip any scripts hiding in them. Next, check the preview before saving.
Open tool →Image Size Finder
Read the real dimensions, weight and format of every picture at once, without an editor.
Open tool →Lazy Loading Checker
Which images load too early, which wait too long and therefore slow the largest paint, and which lack a size.
Open tool →QR Code Generator
Create a code for a link, a Wi-Fi network or a message. A static QR code with no expiry date.
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Email and outreach
Sort your inbox, check a campaign before it goes out, and sign off in style.
Gmail Variations Generator
List every dot, plus-tag and capital spelling of one Gmail address.
Open tool →HTML Email Previewer
See an HTML email in Gmail on desktop and mobile before you send.
Open tool →Email Signature Generator
Build an HTML signature from twenty templates for Gmail and Outlook.
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Developers and data
Encode, hash, format and minify. These run on your machine and send nothing.
Base64 Encoder and Decoder
Encode text or any file to Base64, or decode it back, with accents, emoji and binary kept intact.
Open tool →Hash Generator
MD5, SHA-1, SHA-256 and SHA-512 side by side, with HMAC keys and a checksum compare box.
Open tool →MD5 Generator
Turn any text into its MD5 checksum, one hash or one per line, and check a hash somebody gave you.
Open tool →JSON Formatter
Beautify or minify JSON, and see the exact line and column of any mistake it contains.
Open tool →JSON Viewer
Read JSON as a tree or a table, search it, copy paths and edit values.
Open tool →JSON Stringify
Stringify, escape, URL-encode or Base64 JSON, and undo each one.
Open tool →JSON Diff
Compare two JSON, XML or YAML documents and list every change.
Open tool →JSONPath Tester
Run a JSONPath on your JSON and see every match with its path.
Open tool →JSON to Code Converter
Turn a JSON sample into classes for C#, Java, TypeScript and six more.
Open tool →Excel Converter
Open an Excel file and convert it to JSON, CSV or XML, or build a workbook from your data.
Open tool →JSON to HTML Table Converter
Turn JSON, CSV or spreadsheet cells into clean table code, or clean up text from Word.
Open tool →XPath Tester
Run XPath on your XML, see every match, open a tree or turn XML into text.
Open tool →XSLT Transformer
Run an XSLT stylesheet on your XML, preview the HTML, or turn XML into classes.
Open tool →YAML Validator and Formatter
Check YAML with exact line errors, tidy it, view a tree, or convert it to JSON and Base64.
Open tool →XML to CSV Converter
Turn XML, YAML, CSV, TSV and JSON into each other in one box.
Open tool →CSV Viewer and Editor
Read CSV in a table, fix cells by hand, clean it up and copy it back.
Open tool →SQL Formatter
Format, minify, escape and unescape SQL in your browser.
Open tool →CSV to SQL Converter
Turn CSV, TSV and JSON into SQL, or SQL INSERT rows into data.
Open tool →HTML to JSON Converter
Turn HTML into JSON, XML, YAML, CSV, text or code strings, and back.
Open tool →BBCode to HTML Converter
Turn BBCode, HTML and Pug into each other, with a safe live preview.
Open tool →RSS Feed Viewer
Read RSS, Atom and OPML in a clean list, and copy them as JSON, CSV or XML.
Open tool →Unit Converter
Convert length, weight, temperature, volume, speed and more.
Open tool →Text Cleaner
Remove extra spaces, empty lines, line breaks, accents and more from any text.
Open tool →String Escape And Unescape
Escape or unescape text for HTML, XML, JavaScript, Java, C#, Python, PHP, SQL, CSV and URLs.
Open tool →Px To Rem Converter
Convert px, rem, em, pt, percent and viewport units, or a whole piece of CSS.
Open tool →Random Number Generator
Also pick random whole numbers, decimals, primes, bytes and strings from a secure source.
Open tool →Image To Base64 Converter
Also turn a picture into a data URI, img tag, CSS or Markdown, or Base64 back into a picture.
Open tool →Bitwise Calculator
Then run AND, OR, XOR, NOT and shifts on 8 to 64 bit numbers.
Open tool →Text To Hex Converter
So turn text into hex, Base32, Base58 or Base85, and back.
Open tool →IP Address Converter
Next, turn IPv4 and IPv6 addresses into decimal, hex, binary, short and full forms.
Open tool →Regex Tester
Finally, test a regular expression, see every match and copy it as code.
Open tool →CSS Selector Tester
Run a CSS selector on your own markup, read it in plain English and score it against a rival.
Open tool →CSS Preprocessor Converter
Paste SCSS, Less or Stylus and take away plain CSS, or paste flat CSS and get it back nested with the repeated values pulled up as variables.
Open tool →Code Beautifier
Reindent Java, C, C++, ActionScript or a crontab, and get the line number of any brace that does not balance.
Open tool →Syntax Highlighter
Colour a listing in twelve languages, then copy it out as escaped HTML, a word processor block, plain text or the stylesheet alone.
Open tool →curl Converter
Then paste a curl command copied out of devtools and take the same request away as PHP, Python, JavaScript, Go or raw HTTP.
Open tool →Text Repeater
Also repeat text, shuffle lines, build numbered strings and flip or tidy text.
Open tool →User Agent Parser
Also read any browser string and name its browser, system, device and bot.
Open tool →Random Name Picker
Also draw winners from a list, build even teams, shuffle an order or pair matchups.
Open tool →Random Data Generator
Also make IP and MAC addresses, dates, times, fractions and test tables as JSON, XML, CSV or TSV.
Open tool →Screen Resolution Checker
Read your screen size, viewport, device pixel ratio, aspect ratio, pixel density and refresh rate.
Open tool →JSON to CSV Converter
Turn nested JSON into a clean spreadsheet table, with long IDs kept exact and every change listed.
Open tool →CSV to JSON Converter
Turn a spreadsheet export into clean JSON records, with quoted commas read right and zip codes kept whole.
Open tool →JSON to XML Converter
Turn JSON into valid XML with one root, real attributes from @keys and tag names that always parse.
Open tool →XML to JSON Converter
Read any feed or API reply as JSON, with attributes kept as @keys and repeated tags turned into lists.
Open tool →YAML to JSON Converter
Turn configs and manifests into exact JSON, with anchors resolved and every indent error pinned to its line.
Open tool →JSON to YAML Converter
Write clean YAML from JSON, with values like NO, 1.10 and dates quoted so they keep their meaning.
Open tool →Unix Timestamp Converter
Also turn epoch numbers into dates in any time zone and back, with exact milliseconds and clock changes caught.
Open tool →Binary Translator
Then turn text into binary, hex or decimal and back, with emoji handled.
Open tool →XML Formatter
Also pretty print, minify and validate XML, with every error shown on its line.
Open tool →Number Base Converter
Binary, octal, decimal, hex or any base to 36, exact even for huge numbers, with every step shown.
Open tool →Roman Numeral Converter
Turn numbers and dates into Roman numerals and back, with every symbol explained and loose forms caught.
Open tool →Number to Words Converter
Then write any amount in words in six languages, for cheques and invoices.
Open tool →Morse Code Translator
Text to Morse and back, with sound, a flashing light, Arabic Morse and a WAV download.
Open tool →UUID Generator
Also make versions 1 to 7 in bulk, with a checker for any UUID.
Open tool →Bcrypt Generator
Hash passwords with bcrypt at any cost, or check a password against a hash, all in your browser.
Open tool →AES Encryption and Decryption
So encrypt and decrypt text with AES-256 in GCM, CBC or CTR, from a password or a key.
Open tool →Markdown to HTML Converter
Then convert Markdown to tidy HTML, or take HTML back to Markdown.
Open tool →Text Sorter
Then sort lines alphabetically, naturally, by number, by length or at random.
Open tool →Email Extractor
Also pull every email address, link or domain out of any text.
Open tool →JavaScript Minifier
Strip the comments and spacing out of a script, and check the result still matches your code.
Open tool →JavaScript Validator
Read a script and name the first syntax error, with the line and the column it stopped on.
Open tool →CSS Minifier
Shrink a stylesheet without breaking calc() or your selectors. Each run double-checks its own result.
Open tool →HTML Minifier
Shrink your markup without running your words together or flattening a pre block.
Open tool →Color Code Picker
Convert hex to rgb, rgb to hex and hsl, with opacity, a shade ramp and a live contrast reading.
Open tool →Color Scheme Generator
Start from one color and take away six harmonies on a wheel, a contrast table with the fixed values and the palette as CSS, Tailwind, SCSS or JSON.
Open tool →Password Generator
Build a random password or a passphrase you can say out loud. Your browser builds it on the spot, and nothing travels anywhere.
Open tool →Private Paste Bin (opens in a new tab)
Share a note or a snippet privately, with an expiry date that you set yourself.
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Marketing calculators
Two sums worth doing before you spend, and again after.
CPM and CPC Calculator
Turn spend, impressions, clicks and conversions into seven campaign numbers. Above all, each one shows its formula.
Open tool →Conversion Rate Calculator
Work out your rate, the value per visitor and the gap to a target. Similarly, compare two variants of a test.
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More tools
Newer than the groups above, and not yet filed with them.
SEO Checker
About fifty on-page checks, scored in six groups, with a to-do list sorted by what to fix first.
Open tool →
What the Denwix Free Tools Cover
This page gathers every tool we have built into one list. Every tool focuses on one task and does it properly. Also, each one is free to open and free to use, with no limit on how often you come back.
Most tools online want something first. An email address, a trial, or a watermark on the way out. However, none of these free tools ask for any of that. Open the page, and the tool is ready and waiting.
One more rule applies to every tool here. The work happens on your own device wherever it possibly can. Therefore your files and your text usually never travel anywhere at all.
Why Denwix Offers These Tools at No Cost
Making websites is the Denwix day job. Along the way we kept needing the same small jobs done. So we built the tools for ourselves first, and then put them online.
Keeping them free costs us very little. Because the work runs in your browser, there is no server bill that grows with use. In short, there is nothing here for us to meter.
Things Denwix Never Does With Your Data
Denwix never takes your files onto a server. Denwix keeps none of the text you enter. Nor do we run adverts or third-party trackers on these pages. None of the in-browser tools asks you to log in. The shortlink generator is the one exception: it asks you to sign in, because every link lives on this domain and has to belong to somebody. That leaves your email address as the only detail Denwix holds.
Free Tools We Are Still Building
These are in progress. They are listed without a link for now, because the pages are not live yet.
AI Image Generator
Make simple images for a blog post or a social card, without hunting through stock photos.
AI Voice Studio
Turn a written script into spoken audio, for a video voice-over or an accessible version of a page.
Rules Every Denwix Tool Follows
Each tool on this page sticks to one short set of rules. Consequently you always know what you are getting before you click.
The heavy lifting stays on the device in your hand or on your desk
Any task a browser can handle stays in your browser. So your files and your text stay with you rather than passing through us.
Only one tool needs an account
The browser tools ask for nothing at all. Only the shortlink generator needs an account, and that is so every link has an owner.
No adverts, no trackers
These pages carry no advert slots and no third-party scripts. Meanwhile the pages stay small, so they open quickly.
No hidden limits
You will not hit a daily cap or a paywall halfway through a job. In short, the free tools are simply free.
Fast by design
Each page is one small file with its styles inside. As a result the tool works almost as soon as you tap the link.
Works on a phone
Every control suits a thumb and every page reflows to a narrow screen. So the tools work away from a desk too.
Getting The Most From These Free Tools
A few small habits make these quicker to live with. In practice, each one saves a minute or two every time.
- Bookmark this page. It is the quickest way to reach every tool. So you never have to remember an individual address.
- They work offline once open. Your browser does the processing. Therefore a dropped connection mid-task usually does not matter.
- Denwix saves nothing on your behalf. Because nothing is stored, copy your result before you close the tab. Otherwise it is gone.
- Keep your originals. Always convert a copy of an image. In short, keep the master file somewhere safe.
- Every Denwix tool fits a 360-pixel phone screen as well as a desktop. You need neither an installer nor a licence. As a result, one link behaves the same on a laptop, tablet or phone.
- Let us know which tool you still need. Many of these tools began as a reader suggestion. Consequently the next one probably will too.
Free Tools FAQ
Do these free tools stay free after the first use?
Yes, with no paid tier waiting further down the line. There is no trial, no watermark and no paid tier waiting at the end. Because the work happens in your browser, running them costs us almost nothing.
Must I sign up before using these Denwix tools?
No. Nothing here asks you to register or hand over an email address. So you can open any tool and finish the job within seconds of arriving.
Do my files or passwords ever reach Denwix servers?
No. The password generator and the image converter both run entirely on your device. Therefore the file you pick and the password you make never reach a server at all.
May I use these free tools on paid client projects?
Yes. You may use them for personal work, for commercial work and for client work alike. Also, there is no limit on how many times you use them.
Will the Denwix tools run on my phone?
Yes. Every page reflows to a narrow screen and every control is sized for a thumb. So you can shorten a link or make a password while you are away from a desk.
When will the remaining tools be ready?
They are listed above without a link, and each goes live as it is finished. Meanwhile, if one of them would be especially useful to you, tell us and we will prioritise it.
Choose a Denwix Tool and Start
Eighty-seven free tools are ready right now, and two more are on the way. No installer, no sign-up form and no bill.