Free Online Developer Tools

Generate stunning images from text prompts

Text & image to video, no signup

Generate music, sound effects, and speech from text

230+ voices, 4 engines — narrate text with realistic AI voices

Enhance & upscale photos to 4K

Create artistic AI illustrations

Generate professional brand logos

Create fun stickers with AI

Design unique tattoo concepts

Retro pixel art from text descriptions

Extract data from any webpage instantly

Score and optimize AI prompts instantly

Improve prompts with proven techniques

Shorten prompts, reduce token usage

Expand short prompts with detail

Format prompts as XML, Markdown, JSON

Build structured JSON prompt objects

Build structured Markdown prompts

Test prompt quality with 9 criteria

Count tokens, check context window fit

OpenAI GPT API pricing calculator

Estimate Claude API token costs

Compare GPT, Claude, Gemini costs

DALL-E, Flux, SD pricing calculator

Translate prompts between AI models

Format & validate JSON

Compare two JSON objects visually

Convert JSON arrays to CSV

Convert CSV data to JSON

Generate TypeScript interfaces

Convert JSON to XML format

Parse XML into clean JSON. Handles attributes, namespaces and nested elements.

Tab-separated values from JSON

Tab-separated to JSON

Convert YAML — supports anchors, aliases, multi-doc streams

Format and validate YAML files

Encode text or files to Base64

Decode Base64 back to text

Convert images to Base64 data URLs

Percent-encode URL strings

Decode percent-encoded URLs

Encode special HTML characters

Decode HTML entities

Convert text to hexadecimal

Decode hex to readable text

Convert text to binary code

Decode binary back to text

Encode/decode ROT13 text

Translate text to Morse code

Compare two text files side-by-side

Live regular expression tester

Render Markdown in real-time

Convert Markdown to HTML code

Convert HTML to Markdown syntax

camelCase, snake_case, UPPER & more

Count words, chars, sentences

Convert text to URL-safe slugs

Generate placeholder text

Sort, dedupe, and reorder lines

Bulk find & replace in text

Inspect string encoding & length

Reverse any string instantly

Trim & normalize whitespace

Strip HTML tags to plain text

Remove Markdown formatting

Inspect Unicode code points

Multi-tab text editor — syntax hint, find/replace, download

Format, validate & transform XML

Get the transcript from any YouTube video (public captions)

Pull unique email addresses out of any text, log or CSV

Pull unique http/https URLs from any text or HTML source

Pull international phone numbers out of any text or CRM export

Deduplicate a list of lines with optional case + whitespace rules

Sort any list — alphabetical, numeric, length, or random shuffle

Convert TOML config to JSON

Decode & verify JWT tokens

Strong random passwords

Generate v4, v1 UUIDs

MD5, SHA-1, SHA-256 & more

Test REST APIs in the browser

Write & explain cron expressions

Convert epoch ↔ human time

AES-256-GCM encryption in browser

HEX, RGB, HSL, CMYK conversions

Live HTML preview in browser

Convert HTML to React JSX

Minify CSS code by removing whitespace, comments and redundant rules. Reduce file size instantly.

Minify HTML markup

Format & beautify SQL queries

Convert cURL commands to JS fetch

Format and prettify cURL commands

Parse URL components visually

Convert between number bases

Escape & unescape strings

Find MIME type by extension

Compare semantic versions

Linux file permissions calculator

Parse and validate .env files

Parse and filter log files

Create diagrams with Mermaid.js

Test WebSocket connections live

WCAG color contrast checker

Create CSS gradients visually

Build beautiful color palettes

All HTTP status codes explained

Box shadow generator with preview

Generate .gitignore for any stack

Generate open-source licenses

Validate .env key/value pairs

Query DNS records for any domain

Look up IP address geolocation

Compare npm packages side-by-side

Prettify JS, CSS, HTML code

Quick Linux command reference

Run HTML/CSS/JS live in browser

Monaco + JS/TS/Node/Python/Go/Notebook — sandboxed browser IDE

Run Lambda handlers in-browser

Generate & verify HMAC webhooks

Sunrise, sunset, moon phase

Chain text transformations

Save snippets locally

Multi-tab in-browser scratch editor with autosave

Generate XML sitemap for any site

Generate robots.txt with presets

Generate SEO + OG + Twitter meta tags

Generate and preview OG/Twitter tags

Generate QR codes for any text

Scan QR codes from images or your camera — no app

Real-time entropy + crack-time estimate, in-browser

Linear, radial and conic CSS gradients — live preview, copy-ready CSS

Ready-to-copy clip-path shapes — hexagons, stars, arrows, chevrons

WCAG 2.1 AA / AAA contrast ratio checker — WebAIM-compatible

Check if your meta description will truncate in Google search

Generate title, description, canonical, OG and Twitter meta tags

Resize images to any dimension

Compress images without quality loss

Convert PNG, JPG, WebP, GIF

Minify and optimize SVG files

View image metadata & EXIF data

Remove image backgrounds with AI

Combine photos side-by-side, stacked, or in a grid

Convert video clips to animated GIFs in-browser

Convert MP4, WebM, MOV, AVI, MKV entirely in your browser

Pick colors from any image + extract a 5-color palette

Extract text from images — 9 languages, in-browser OCR

Download YouTube thumbnails in every resolution

Combine multiple PDFs into one

Split PDF into separate pages

Reduce PDF file size

Rotate PDF pages any angle

Reorder or remove PDF pages

Add page numbers to PDFs

Edit individual PDF pages

Add text or image watermarks

Convert images to PDF

Convert plain text to PDF

Render HTML pages as PDF

Export Jupyter notebooks to PDF

Convert PDF pages to images

Diff two PDFs side by side

°C, °F, Kelvin conversions

B, KB, MB, GB, TB conversions

Length, weight, speed & more

Convert numbers to English words

Convert to/from Roman numerals

Convert time durations

Fast percentage calculations

Calculate image aspect ratios

Real-time currency rates

Calculate monthly loan payments

Calculate simple interest

Compound interest calculator

Add/remove Indian GST

Calculate sale prices & savings

Split bills and calculate tips

Split group bills fairly with minimum settle-up transactions

Return on investment calculator

P&L and margin calculator

Calculate salary hike percentage

Body Mass Index calculator

Basal Metabolic Rate calculator

Daily calorie needs estimator

Daily water intake calculator

Estimate body fat percentage

Total Daily Energy Expenditure

Protein/carbs/fat split for 8 diet plans

Devine, Robinson, Miller & Hamwi formulas

5 training zones from max HR & resting HR

Bedtime / wake time using 90-min cycles

Predict fertile window from LMP

Weeks, trimester & due date

Predict next 6 menstrual periods

Solve quadratic equations ax²+bx+c=0

Calculate triangle sides

Greatest common divisor & LCM

Plot math functions visually

Convert time across timezones

See current time worldwide

Calculate exact age from birthdate

Count days, weeks, months between dates

Countdown to any date/event

Find ISO week number of any date

Calculate deadline or due dates

Add/subtract days from a date

Convert Unix epoch ↔ ISO 8601 (s / ms / µs / ns)