DevUtilsNow
Browse tools

The toolbox that
never phones home.

Format, encode, hash, and debug — entirely in your browser tab. No uploads, no accounts, no analytics watching what you paste.

Browse all tools → See how it works
Free No account, no limits — every tool, always free.
RUNS LOCALLY
json-formatter.tool live
 Nothing you type leaves this tab
// introduction
Built on one rule: your input never leaves your browser.
Every formatter, encoder, and debugger here runs as plain JavaScript in your tab. No servers were involved in producing this sentence, and none are involved when you use any tool on this site.
0
Tools shipped
0
Servers involved
0%
Client-side processing
0
Tool categories
// featured tools
The tools developers reach for first.
View all 36 tools →
01
JSON Formatter & Validator
Pretty-print, minify, or validate JSON, with inline error locations instead of a vague "unexpected token."
<1son 1MB input
3modes: pretty / minify / tree
Open JSON Formatter →
 json-formatter
FormattedMinified
{
  "name": "devutilsnow",
  "tools": 36,
  "private": true
}
02
Base64 Encode / Decode
Convert text and images to and from Base64 in either direction — and read the guide if you're not sure why you'd need to.
2-wayencode & decode
Images& plain text
Open Base64 tool →
 base64-codec
TEXTHello, DevUtilsNow!
encode 
BASE64SGVsbG8sIERldlV0aWxzTm93IQ==
03
Regex Tester
Test a pattern against sample text with live match highlighting — see exactly what it catches before it ships.
Livematch highlighting
Groupscaptured & listed
Open Regex Tester →
 regex-tester
/[\w.]+@[\w.]+/g
Reach us at [email protected] or [email protected] today.
2 matches
04
JWT Decoder
Decode a JSON Web Token's header and payload to inspect its claims — the token is read locally and never sent anywhere.
3parts decoded
Localtoken never logged
Open JWT Decoder →
 jwt-decoder
eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiIxMjM0NTY3ODkwIn0.SflKxwRJSMeKKF2QT4
decode 
{
  "sub": "1234567890",
  "name": "DevUtilsNow",
  "admin": true
}
05
Hash Generator
Generate MD5, SHA-1, SHA-256 and SHA-512 hashes from any text, computed locally with the browser's Web Crypto API.
4hash algorithms
One-waynot reversible
Open Hash Generator →
 hash-generator
TEXTDevUtilsNow
hash 
SHA-256e03d599c66c3665d9b5fa880…
MD5949572af74313be300919add…
// also popular
Newer tools worth a look
Password Generator Generate strong, random passwords with a strength estimate.  Unix Timestamp Converter Convert Unix timestamps to human dates and back, with a live clock.  JSON Diff Compare two JSON documents and see exactly what changed.  JSONPath Tester Run a JSONPath expression against JSON and see the matches.  Cron Expression Parser Explain a cron expression in plain English and see its next runs. 
// why developers pick us
No friction between you and the answer.
No server hop
Every tool runs as JavaScript in your browser tab.
No account
No sign-up wall between you and a tool you need right now.
Instant results
No spinner waiting on a round trip that shouldn't exist.
Works offline
Once a tool page loads, it keeps working without a connection.
No dark patterns
No ads inside the tool, no upsell interrupting your input.
Free, no catch
Every tool on this site is free — no tiers, no limits.
// the difference
Compared to a typical "online tool" site.
TYPICAL ONLINE TOOL
Upload & hope
  • Sends your input to a server to process it
  • Asks for an account after a few free uses
  • Runs ads inside the tool itself
  • Rate-limits or paywalls large inputs
DEVUTILSNOW
Runs where you are
  • Processes everything in your browser tab
  • No account, ever, for any tool
  • No ads inside the working area
  • No artificial limits on input size
// faq
Questions worth answering upfront.
Correct. Every tool runs as JavaScript in your browser tab — there's no network request carrying your input anywhere, which you can verify yourself in your browser's dev tools.
No. Every tool is usable immediately, with no sign-up or login at any point.
Yes, once a tool's page has fully loaded, it keeps working without an internet connection.
No — Base64 is an encoding, not encryption. It's reversible by anyone with no key required. The guide linked from the Base64 tool covers this in more detail.
New tools ship on an ongoing basis, prioritized by what developers ask for most often.
Open a tool and get straight to work.
No signup, nothing to install — 36 tools that run entirely in your browser, free.
Browse all tools →