Developer API
API Ready
Background Remover
Remove image backgrounds locally in your browser with no upload and download a transparent PNG.
⚡ 100% Free • No Signup Required • Privacy First
High-Performance Web Utilities.
Zero Bloat. Instant Results.
Explore our suite of developer-friendly calculators, converters, and web tools designed for maximum speed and complete privacy.
Featured Web Tools
Showing 22 active tools
Utility
Business Card OCR
Privacy-first business card OCR: client-side extraction of name, title, company, phone, email and address from PNG/JPG. Export vCard 4.0, CSV or JSON.
Utility
WCAG color contrast checker
Client-side WCAG color contrast checker - enter HEX/RGB/CSS colors, get WCAG 2.2 contrast ratio, AA/AAA pass-fail, preview, export JSON, and color suggestions.
Converter
Cron Time Converter
Convert a 5-field cron schedule from server time to your timezone and UTC. Preview 10 runs, validate syntax, and understand DST changes.
Utility
Cron Schedule Explorer
Explore when a cron schedule fires next — 5-field, seconds-based, and Quartz expressions. Server and local times side by side, DST skip/double warnings, shareable permalink.
Converter
CSV to JSON Converter
CSV to JSON converter — paste or upload CSV/TSV, autodetect delimiter, preview rows, group-by for nested JSON, and download JSON. Client-side, no upload.
Converter
Curl Command Converter
Convert curl commands from Chrome DevTools into request details and JavaScript Fetch, Python, Go, and PHP code locally in your browser.
Utility
Text Anonymizer / Redaction Tool
Redact supported PII from logs, tickets, emails, and contract text locally in your browser with deterministic rules and no upload.
Utility
Duplicate Invoice Checker
Free duplicate invoice checker — client-side, no signup. Detect exact & near-duplicates (same supplier + amount within 7 days).
Utility
Local .env File Validator
Validate and compare .env files in your browser to find missing keys, extra keys, duplicates, and format errors without exposing environment values.
Calculator
Expense What-If Calculator
Free expense what-if calculator — no login. Change a line item, tax rate, discount or service fee and see the new total, the per-line breakdown, and how much it moved from the original.
Utility
GitHub Actions Workflow Validator
Validate GitHub Actions workflow YAML in your browser with syntax errors, line and column details, workflow checks, cron basics, and local privacy.
Utility
HTTP Cache Freshness Calculator
Calculate HTTP cache freshness from Date, Age, max-age, s-maxage, and response headers. Compare private and shared cache results with RFC 9111 rules.
Calculator
Mortgage Calculator
Calculate your monthly mortgage payment, total interest and full amortization schedule. Enter loan amount, annual rate and term (years) for instant results.
Utility
EXIF Remover
EXIF Remover: remove photo and PDF metadata (location, camera, author, thumbnails) entirely in your browser — no uploads, instant preview and batch support.
Calculator
Percentage Calculator
Free percentage calculator - compute Y% of X, find what percent X is of Y, or calculate percent change. Handles negatives and division-by-zero.
Utility
In-browser receipt OCR
Privacy-first in-browser receipt OCR using Tesseract.js — extract merchant, date, total, tax and currency from JPG/PNG/HEIC/PDF and export CSV, Excel-compatible XLS or JSON.
Utility
Regex Explainer
Explain JavaScript regex patterns online with token-by-token meanings, syntax positions, trap warnings, and browser-based test matches for captures.
Utility
SQL Execution Plan Visualizer
SQL execution plan visualizer for PostgreSQL and MySQL: paste EXPLAIN output, explore the plan tree, compare rows, and review next actions.
Utility
Stack Trace Formatter & Parser
Format pasted Java, .NET, Node.js, Python, and Go stack traces in your browser, preserve parsed frames, inspect threads, and export structured results locally.
Converter
Length converter
Length converter - instant, exact conversions between m, cm, km, in, ft, yd and mi using NIST/international definitions. Real-time updates.
Text & Content
API Ready
Word Counter
Paste text in any language and get word, character, sentence, paragraph, and reading time statistics.
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Built for Developers & Power Users
Processed in Your Browser
Tools that handle your own files — images, spreadsheets, receipts — do the work in your browser and upload nothing. Every tool states plainly whether it sends anything to a server. See the privacy policy.
No Framework Bloat
Plain HTML, CSS and JavaScript — no React, no bundler runtime. Pages are small and load fast; tools that need an ML model tell you its size before you download it.
Programmable REST APIs
Need to automate? Server-enabled tools expose clean JSON API endpoints you can call directly from your code.