Free tools that just work

JSON Formatter

Paste messy JSON, get it back clean and readable, with the exact line and column of any error. Nothing leaves your browser.

Create a QR code for a website, text, email, phone, SMS, WhatsApp, Wi-Fi, a contact card, a map location or a calendar event. Customize the colors, pattern and size, add your logo, and download it in PNG, SVG, PDF or JPG. The code is static and yours forever, and nothing you enter is uploaded.

Password Generator

Generate a strong random password or a memorable word passphrase, drawn from your browser's own cryptographically secure randomness so nothing is ever transmitted, logged or stored. Tune the length, the character sets and the wordlist, and watch a live strength meter that does not guess: because the tool made the secret, it knows its exact entropy in bits and shows an honest estimate of how long it would take an attacker to crack. Copy it and go.

Invoice Generator

Create a professional invoice and download it as a clean PDF, with your details, your client, line items, tax, a discount and a running total that always adds up. Fill in the form and watch the invoice build live, then download it. Everything happens in your browser, so your rates, clients and financial details are never uploaded to anyone.

Image Compressor

Drop in a batch of images and shrink them all with a single quality slider, right here in your browser. Compare the before and after side by side to confirm the quality held, convert to modern WebP in a click, and download one file or the whole set as a zip. Nothing is uploaded, so even a folder of client photos never leaves your machine.

JWT Decoder & Verifier

Paste a JSON Web Token and it is decoded instantly in your browser: the header and payload laid out as readable JSON, every registered claim explained in plain language, and each time claim turned into a real date with a live verdict on whether the token is active, expired or not yet valid. Then go one step further than any decode: paste the secret or the PEM public key and it verifies the signature for real with the Web Crypto API. Your token, secret and key never leave the page.

Browse the full library

30 tools

JSON Formatter

Paste messy JSON, get it back clean and readable, with the exact line and column of any error. Nothing leaves your browser.

UUID Generator

Generate random v4 or time-ordered v7 UUIDs, one or five hundred at a time, and copy or download them in a click. Uppercase, hyphen and brace formatting are all one toggle away. Then paste any UUID back in to read its version, its variant, and for a v7 the exact moment it was created. Everything is minted in your browser with the Web Crypto API, so no identifier ever touches a server.

Regex Tester

Build and debug a regular expression against your own text and watch every match highlight as you type. See the capture groups broken out, named and numbered, preview a find-and-replace, toggle the flags one at a time, and start from a library of common patterns. Nothing you enter leaves your browser, and a built-in cheatsheet is one click away.

JWT Decoder & Verifier

Password Generator

CSS Minifier & Beautifier

Paste your CSS and either minify it to the smallest valid form for a faster website, or beautify it into a clean, consistently indented layout you can actually read. It parses the CSS properly, so strings, data URIs and calc() expressions are never broken, and it shows you the exact bytes saved. Everything runs in your browser, so nothing is uploaded.

Meta Tag Generator

Generate title, description, Open Graph and Twitter tags with a live preview of your Google result and social card. Nothing leaves your browser.

Schema Markup Generator

Build structured data for ten rich-result types from a form, and see live whether Google will actually show the rich result, not just whether the JSON is valid. Preview the result, paste existing markup back in to fix it, and link several entities into one @graph. Nothing leaves your browser.

Robots.txt Generator

Generate a correct robots.txt, then test any path against it using Google's real matching rules, the tester Google removed from Search Console. Check it per bot, lint it for the mistakes that quietly cost traffic, and audit any live site against its own sitemap. The builder and tester run in your browser; only the live-site audit fetches the URL you enter.

XML Sitemap Generator

Crawl your site to build a valid XML sitemap, or paste your URLs. It excludes anything your robots.txt blocks, validates and dedupes, and splits past 50,000 URLs into a sitemap index. The crawl runs on our server; the XML is built in your browser.

Hreflang Tag Generator

Build the complete, self-referencing, reciprocal hreflang set for every language and region version of your page at once, with the ISO codes validated and all three formats Google accepts: HTML, XML sitemap and HTTP header. Nothing leaves your browser.

Canonical Tag Generator

Turn a messy URL into the clean canonical it should name, stripping tracking parameters, fragments and default documents, with every change explained. Or audit a live page: is its canonical present, absolute, self-referencing, and does it resolve? Build runs in your browser; the audit is one server call.

QR Code Generator

Invoice Generator

Quotation Generator

Create a clean, professional price quotation and download it as a PDF, with your details, the client, itemised pricing, tax, an optional discount and a clear total. Fill in the form and watch the quote build live, set how long it stays valid, then download it. Everything runs in your browser, so your pricing and your prospects are never uploaded to anyone.

ROI Calculator

Work out the return on any investment or marketing spend: the profit, the percentage return, how many times your money came back, and an equivalent yearly rate so investments of different lengths compare fairly. Switch to marketing mode for ROAS. Every result comes with a plain-language verdict, so the number is never left to be misread. Nothing is uploaded.

Email Signature Generator

Create a clean, professional email signature and paste it straight into Gmail, Outlook or Apple Mail. Add your name, role, contact details, social links, a photo and an accent colour, pick a template, and copy it as formatted HTML that renders properly in every email client. Everything runs in your browser, so none of your details are uploaded.

AI Meta Description Generator

Generate several meta description options for any page in seconds, each written to the length Google actually shows and graded against it so you can see at a glance which will render in full. Describe the page, add your keyword and tone, and get distinct options you can copy straight into your CMS. The tool drafts with a model and then checks the character count itself, so what you copy is ready to ship, not a draft you still have to trim.

AI FAQ Generator

Generate a genuine FAQ section for any page or product in seconds, then copy it as ready-to-paste FAQPage schema built from the exact answers on screen. Describe the topic, add your keyword and audience, and get real questions with complete, self-contained answers. The tool drafts the copy and then generates the structured data itself, so your visible FAQ and your machine-readable schema can never drift apart.

AI Title Tag Generator

Generate several SEO title tag options for any page in seconds, each written to the length search engines show in full and graded against it so you never ship one that gets cut off. Add your topic, keyword and brand, and get distinct, front-loaded titles you can copy straight into your CMS. The tool drafts with a model and then measures the length itself, so what you copy is verified to fit.

Image Compressor

Image Resizer

Resize a batch of images to an exact width and height, or scale them all by a percentage, right here in your browser. Lock the aspect ratio so nothing stretches, choose how each image fills the box when it does not, convert to modern WebP in a click, and download one file or the whole set as a zip. Nothing is uploaded, so even a folder of client photos never leaves your machine.

WebP & AVIF Converter

Convert a batch of JPEG, PNG or GIF images to modern WebP or AVIF, or convert the other way back to JPEG or PNG, right here in your browser. See the real size saving on every image before you download, grab one file or the whole set as a zip, and know that nothing is ever uploaded because every image is converted on your own machine.

SVG Optimizer

Paste or drop an SVG and it is cleaned and shrunk instantly in your browser, with the original and the optimized version rendered side by side so you can confirm nothing visible changed before you download it. Strip editor metadata, comments and redundant precision, tune how aggressively it rounds, and copy or download the result. Nothing is uploaded, and both previews are sanitized so even a hostile file is safe to inspect.

Open Graph & Twitter Card Generator

Fill in a page's title, description, image and URL and get correctly escaped Open Graph and Twitter Card meta tags to paste straight into your head, alongside a live preview of exactly how the link will look when it is shared on Facebook, LinkedIn and X. The preview updates as you type, so you can fix a title that overflows or an image that crops before it goes live, and the built-in checks flag the mistakes, like a relative image URL, that silently break the card. Nothing is uploaded; the tags are built in your browser.

UTM Link Builder

Build a tagged campaign URL that tells Google Analytics, and every other analytics tool, exactly where a visit came from. Fill in the source, medium and campaign, watch the link build live, and get plain-language warnings for the small mistakes that quietly split your reporting. You can also paste an existing UTM link to decode it and see what it is really tracking. Nothing is uploaded.

Social Media Character Counter

Write your post once and see the character count each platform will really apply, not a single generic number. It handles the rules that trip people up: X counts every link as 23 characters and doubles CJK characters, Instagram and LinkedIn cut your text off behind a 'more' link long before the hard limit, and each network caps hashtags differently. You get the live count, the remaining space, the exact point where the feed truncates, and counts of words, hashtags, mentions and emoji. Nothing is uploaded.

URL Slug Generator

Type a title and get a tidy, lowercase, URL-safe slug in real time: accented letters folded to plain ASCII, symbols and punctuation handled sensibly, spaces joined with hyphens, and an optional length cap that trims at a word boundary rather than mid-word. Preview the full URL, drop stop words to keep it keyword-focused, or paste a whole list of titles and slugify them all at once. It runs entirely in your browser; you sign in only to copy the result out.

Ad Campaign Calculator

Enter what you already know about a campaign, the spend, impressions, clicks, conversions and revenue, and get every metric that matters worked out consistently: CPM, click-through rate, cost per click, conversion rate, cost per acquisition, ROAS, profit and ROI. Then read the plain-language funnel summary underneath, which points at the step that is leaking and tells you whether each sale earns more than it costs. Nothing is uploaded and nothing is stored; the maths runs entirely in your browser.

A/B Test Significance Calculator

Enter the visitors and conversions for your control and your variant and get a proper statistical read: each version's conversion rate, the absolute and relative lift, the p-value from a real two-proportion z-test, and a confidence interval on the difference. Instead of leaving you to interpret a p-value, the tool says in plain words whether the result is significant at the level you choose, and warns you when the sample is simply too small to trust. Everything runs in your browser.