Free online tools
for Dev, Content & Business
JSON, Base64, QR Code, UTM, Invoice, CV… 69+ tools run in your browser. Sign in to use — data never leaves your device.
Why DevToolkit
Built for speed, security & simplicity
Fast & light
100% runs in browser, no server. Instant results.
Secure
Your data never leaves your device. We don't store or track.
Every device
Use on desktop, tablet, or phone. Responsive, no app needed.
Tool showcase
Popular tools
Powerful utilities that run entirely in your browser — no data sent anywhere.
JSON Formatter
Format, validate, and minify JSON data online.
Base64 Encode/Decode
Encode and decode Base64 strings online.
QR Code Generator
Generate QR codes for URLs, text, WiFi and more.
UUID Generator
Generate random UUIDs (v4) instantly.
UTM Builder
Build UTM-tagged campaign URLs easily.
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-384, SHA-512 hashes.
Image Compressor
Compress images and convert to WebP format.
JWT Decoder
Decode and inspect JWT tokens online.
Pomodoro Timer
Focus timer with Pomodoro technique.
Calculator Pack
VAT, discount, and margin calculators.
JSON Formatter
Format, validate, and minify JSON data online.
Base64 Encode/Decode
Encode and decode Base64 strings online.
QR Code Generator
Generate QR codes for URLs, text, WiFi and more.
UUID Generator
Generate random UUIDs (v4) instantly.
UTM Builder
Build UTM-tagged campaign URLs easily.
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-384, SHA-512 hashes.
Image Compressor
Compress images and convert to WebP format.
JWT Decoder
Decode and inspect JWT tokens online.
Pomodoro Timer
Focus timer with Pomodoro technique.
Calculator Pack
VAT, discount, and margin calculators.
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