Free tools that run entirely in your browser
QR codes, image compression, passwords, regex, JSON and more — 15 tools that work the moment the page loads. Nothing you paste or upload ever leaves your device.
QR Code Generator
Turn a link, a message or your Wi-Fi details into a QR code in seconds. Choose the colours, then download a PNG for screens or an SVG that stays sharp in print.
- No sign-up and no watermark
- Wi-Fi codes that join the network on scan
- Codes never expire
- Generated on your device
Wi-Fi code
WIFI:T:WPA;S:Cafe Guest;P:••••••••;;
Scan to join — no password typing
PNG · SVG · any colour
Every tool, grouped by what it does
QR codes, image compression and passwords for everyday jobs; regex, JSON and JWT for the technical ones. All free, all in your browser.
Developer
Inspect and debug the formats you work in every day.
Test and explain regular expressions with real-time matching and plain English explanations.
Try nowFormat, validate, and beautify JSON data with syntax highlighting and error detection.
Try nowDecode a JSON Web Token, read its claims, check expiry, and verify HS, RS or ES signatures — without the token ever leaving your browser.
Try nowSee how a link will look when shared, and what's stopping the preview image from showing.
Try nowEncoding & Conversion
Move data between representations without losing anything.
Convert epoch timestamps to readable dates and back, with the unit detected automatically and a live clock.
Try nowPercent-encode and decode URLs, and read any query string as a plain, already-decoded table.
Try nowEncode and decode Base64, including UTF-8 text, URL-safe output, and files or images as data URIs.
Try nowSecurity & Identity
Hashes, tokens, passwords and identifiers.
Generate MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes for text or files, without uploading anything.
Try nowCreate strong random passwords with real entropy figures, generated locally and never transmitted.
Try nowGenerate random v4 or time-ordered v7 UUIDs in bulk, in whichever format your system expects.
Try nowImages & Design
Prepare images, colour and codes for the real world.
Create QR codes for links, text or Wi-Fi networks. Pick your colours and download as PNG or print-ready SVG.
Try nowShrink and convert images to WebP, JPEG or PNG on your own device — your photos are never uploaded.
Try nowTurn one color into a full 50-950 shade scale, with contrast checks and ready-to-paste CSS, Tailwind or JSON.
Try nowText & Writing
Count, measure and reshape written text.
From the blog
A plain-language guide behind every tool — what it actually does, when to reach for it, and the parts that usually trip people up.
Random UUIDs scatter writes across an index. Time-ordered v7 fixes that, at the cost of revealing creation time — how to choose between them.
Why length beats complexity, what entropy in bits actually measures, and why the old advice about special characters made passwords worse.
What it means for a hash to be broken, why fast hashes are the wrong tool for passwords, and how to verify a downloaded file properly.
Frequently Asked Questions
Everything you need to know about DevTools and how it works.
Yes! All our tools are completely free to use with no registration required. We believe in making developer tools accessible to everyone.
No, we prioritize your privacy. All processing happens locally in your browser, and we don't store or transmit your data to our servers.
Once you've loaded a tool, it works completely offline. Perfect for when you're working without an internet connection.
Yes! We're constantly adding new tools based on developer feedback. Check our roadmap or suggest new tools via our contact form.
Yes, DevTools is open source! You can find our code on GitHub, contribute improvements, or even self-host your own instance.
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