1869+ free tools · no sign-up · nothing uploaded
Free tools to make your work simple
1869+ developer, finance, health, math and image tools and calculators — all running privately in your browser. Fast, free, and no account required.
★★★★★ Loved by developers, students & creators
Developer Tools
229 tools →
Financial Calculators
956 tools →
Health & Fitness
6 tools →
Math & Date
622 tools →
Image & Media
56 tools →
- 1869+
- Free tools
- 5
- Categories
- 100%
- In your browser
- $0
- Free forever
Browse by category
Four families of tools, all running locally in your browser. More calculators are added regularly.
Developer Tools
Format, convert, encode and generate — JSON, Base64, JWT, hashes, UUIDs and more, all in your browser.
Financial Calculators
Plan investments, loans, tax and savings — SIP, EMI, income tax, PPF, FD and more, with instant results.
Health & Fitness
Quick body and health calculators — BMI, calories, ideal weight and more.
Math & Date
Everyday math and date tools — percentages, averages, age, date differences and time zones.
Image & Media
Convert and optimise images — PNG, JPG, WebP and more, all in your browser.
Popular tools
The ones people reach for every day.
JSON Formatter
Beautify, minify, validate and convert JSON in real time.
Text Diff Checker
Compare two texts side by side with highlighted changes.
Base64 Encode / Decode
Unicode-safe Base64, with URL-safe and MIME wrapping.
JWT Decoder
Inspect a token's header, payload and expiry instantly.
JSON to CSV
Turn JSON arrays into spreadsheet-ready CSV (and back).
Hash Generator
MD5, SHA-1, SHA-256/384/512 for text or local files.
UUID Generator
Bulk v4 and time-ordered v7 UUIDs, formatted your way.
Regex Tester
Live matches, capture groups, flags and replace mode.
SQL Formatter
Beautify and format messy SQL queries in one click.
XML Formatter
Pretty-print and indent XML with clean formatting.
SHA-256 Hash Generator
Generate a SHA-256 hash from text, instantly.
Slug Generator
Turn any title into a clean, URL-friendly slug.
Developer Tools
Format, convert, encode and generate — JSON, Base64, JWT, hashes, UUIDs and more, all in your browser.
Encoders & Decoders
4 tools
Base64, URL, HTML entities and JWT - encode and decode safely in your browser.
All encoders & decoders →Table Converters
148 tools
Convert tables between CSV, JSON, SQL, Excel, Markdown, LaTeX and more.
All table converters →CSS Generators
10 tools
Visual generators for gradients, shadows, border-radius and more — copy the CSS.
All css generators →SEO Tools
8 tools
Meta tags, Open Graph, robots.txt and UTM links — generate them in seconds.
All seo tools →Financial Calculators
Plan investments, loans, tax and savings — SIP, EMI, income tax, PPF, FD and more, with instant results.
Investments & Returns
7 tools
SIP, lumpsum, mutual-fund returns, CAGR and compound interest.
All investments & returns →Loans & EMI
2 tools
EMI, eligibility and amortisation for home, car and personal loans.
All loans & emi →Savings & Retirement
9 tools
PPF, EPF, NPS, FD, RD and small-savings scheme calculators.
All savings & retirement →Health & Fitness
Quick body and health calculators — BMI, calories, ideal weight and more.
Math & Date
Everyday math and date tools — percentages, averages, age, date differences and time zones.
Unit Converters
614 tools
Convert length, weight, temperature, data, speed, volume and more.
All unit converters →Image & Media
Convert and optimise images — PNG, JPG, WebP and more, all in your browser.
Image Converters
24 tools
Convert images between PNG, JPG, WebP, GIF, BMP, AVIF, SVG and ICO.
All image converters →QR Codes
11 tools
Generate QR codes for URLs, WiFi, vCards, UPI payments, WhatsApp and more.
All qr codes →Image Editing
10 tools
Compress, resize and crop images — free and private, in your browser.
All image editing →PDF Tools
11 tools
Merge, split, rotate and build PDFs — all in your browser, nothing uploaded.
All pdf tools →Why people use TechToolExpert
100% in your browser
Every tool runs client-side. Your data — JSON, tokens, salaries, files — never leaves your computer.
Free, no sign-up
No accounts, no limits, no paywalls. Open a tool and start working immediately.
Built for real work
Full editors, sliders, file upload, copy & download, live results — not toy demos.
Private by design
No data ever hits a server, so there is nothing to leak, log or retain.
Free online tools, without the catch
Most online utilities send your data to a server, bury the tool under ads, or cap usage behind a sign-up. TechToolExpert takes the opposite approach: every tool — from the JSON formatter and text diff checker to the JWT decoder and hash generator — runs entirely in your browser using the Web Crypto and standard JavaScript APIs. Nothing you paste, type or upload ever leaves your machine.
One home for every everyday tool
TechToolExpert started with developer utilities and keeps growing into the tools everyone needs — data converters, encoders and generators today, with financial calculators, health and fitness tools, and everyday math and date helpers being added. Each one is built to be fast, accurate and genuinely useful, with clear explanations and worked examples so you can trust the result, not just copy it.
Pick a tool and get to work
1869+ tools, zero sign-ups, zero uploads.