Developer Tools

Find & Replace

Advanced bulk text replacement tool for Zip archives and code files. Supports smart case matching and filename renaming.

JSON Formatter

Beautify or minify JSON, catch syntax errors with line/column position, and copy the result instantly.

Timestamp Converter

Epoch seconds or milliseconds to date and back: local, UTC, ISO 8601 and relative time.

Cron Parser

Paste a cron schedule — get a plain-English explanation and the next 5 run times in your timezone.

Base64 & JWT

Base64 and URL encode/decode plus a JWT decoder with expiry check — tokens never leave your browser.

Text Diff

Compare two texts line by line — added and removed lines highlighted, nothing leaves your browser.

SQL Formatter

Beautify messy SQL with Oracle / PL-SQL friendly keywords — clauses and subqueries neatly indented.

Regex Tester

Test regular expressions live: match highlighting, capture groups, flags and a replace preview.

Hash & UUID Generator

MD5, SHA-1/256/384/512 digests of any text plus a bulk UUID v4 generator — all client-side.

Color & Contrast Checker

HEX/RGB/HSL conversion and WCAG AA/AAA contrast ratio checking with a live preview.

Markdown Preview

Live split-pane Markdown rendering with tables, code blocks and copy-as-HTML — dependency-free.

URL Slug Generator

Turkish-aware slugs: correct ı/İ/ğ/ş handling, separator choice, length limit and batch mode.

Image to Base64

Drop an image, copy it as a data URI, CSS, HTML or Markdown — with a size-inflation warning.

CSV ↔ JSON Converter

Two-way CSV/JSON conversion with quoted-field support, delimiter auto-detect, header row and type inference.

LLM Token & Cost

Estimate a prompt's token count and compare API cost across GPT-5.6 and Claude models, with caching.

CSV Dataset Profiler

Per-column types, missing values, outliers, class balance and duplicates — your file stays in the browser.

3D Print Cost

Calculate the real cost of a 3D print: filament, electricity, failure buffer and a suggested selling price.

Resistor Color Code

Decode 4, 5 and 6-band resistors visually: value, tolerance range and temperature coefficient.

ESP & Arduino Pinout

Interactive ESP8266 / ESP32 / Arduino Uno / Nano pin reference: safe pins, boot warnings, ADC, PWM, I2C and SPI.

LED Resistor & Divider

LED series resistor with E12/E24 standard values and power rating, plus a voltage divider that solves for any missing value.

Battery Life

Estimate how long an ESP or IoT node runs on battery: deep-sleep aware, with daily consumption breakdown.

Ohm's Law

Enter any two of voltage, current, resistance and power — the other two are solved with smart units.

Filament Remaining

Weigh a spool and get remaining grams, metres and how many more parts you can print.

Coming soon...

New productivity tools will be added here.