Free developer tools that run in your browser
Eight tools for the small things that interrupt real work. No sign-up, no upload, no pop-ups — open, paste, done.
All tools
14 tools · growingQR Code Generator
Generate and download QR codes for URLs and text, as PNG or SVG
{}JSON Formatter
Format, minify and validate JSON, with error line and column
B64Base64
Encode and decode Base64 with full UTF-8 support
TSTimestamp
Convert Unix timestamps to dates and back, with a live clock
IDUUID
Generate UUID v4 and v7 in bulk, upper or hyphen-free
%20URL Encoder
Encode and decode URLs, and split query strings into a table
.*Regex Tester
Test regular expressions with live highlighting and capture groups
***Password
Generate strong random passwords locally, in bulk
#Hash
MD5, SHA-1, SHA-256 and SHA-512 in one pass
JWTJWT Decoder
Decode JWT header and payload with exp / iat dates and expiry check
±Text Diff
Compare two texts line by line with color-coded changes
01Number Base
Convert between binary, octal, decimal, hex and any base 2-36
AaText Tools
Count, dedupe, sort, change case and strip blank lines
⏱Cron Parser
Explain cron expressions in plain English and preview the next runs
What this site is for
There is always some small thing in the way: an API response crammed into one unreadable line, a timestamp you cannot place, a password that has to be long and actually random. These tools exist for that — open, paste, take the result, close the tab.
Why everything runs in the browser
- Nothing is uploaded. What you paste never leaves your machine, so API tokens and internal logs are fine here.
- It is fast. No round trip, no queue on a server, results appear immediately.
- No account. No login, no usage caps, no paywall.
- Works offline. Once the page has loaded, cutting the network changes nothing.
How to use it
- Pick a tool from the grid above, or search for it.
- Paste your input and press the action button.
- Copy the result with one click.
FAQ
Are these tools really free? Is there a usage limit?
Free, with no limit. The site pays for its domain and hosting with the ads on the page; the tools themselves are not restricted.
Is my input sent to a server?
No. Every calculation happens in JavaScript on your device. You can confirm it yourself in the Network panel of your browser dev tools.
Does it work on mobile?
Yes. The layout is responsive and the main actions are reachable with one thumb.
Can I ask for a tool that is not here yet?
Please do — use the contact page. Requests that keep coming up get built first.