Calculators
8 toolsPercentage Calculator
Four modes: % of a number, ratios, increase and decrease.
Age Calculator
Exact age or time between two dates, down to the hour.
BMI Calculator
Body Mass Index with metric/imperial and category badge.
Loan EMI Calculator
Monthly EMI, total interest, and amortization table.
Compound Interest Calculator
Project growth with any compounding frequency, plus chart.
Tip Calculator
Tip amount and per-person split for any group size.
Discount Calculator
Final sale price, savings, and reverse discount percent.
GST / Sales Tax Calculator
Add or remove tax with GST presets or a custom rate.
Text & Writing
7 toolsWord & Character Counter
Live word, character, sentence and reading-time counts.
Case Converter
Switch between 9 text cases including camelCase and snake_case.
URL Slug Generator
Turn titles into clean, lowercase, hyphenated URL slugs.
Lorem Ipsum Generator
Generate placeholder text by words, sentences, or paragraphs.
Remove Duplicate Lines
Delete repeated lines from lists, with trim and sort options.
Find and Replace
Bulk find & replace with regex and case-sensitive options.
Text Reverser
Reverse text by characters, words, or line order.
Developer / SEO
7 toolsJSON Formatter & Validator
Pretty-print, minify, and validate JSON with error locations.
Base64 Encoder / Decoder
Encode/decode Base64 for text and files (drag & drop).
URL Encoder / Decoder
Percent-encode/decode URLs (component or full-URL).
Meta Tag Generator
Build SEO, Open Graph, and Twitter meta tags to paste.
Robots.txt Generator
Create and download a valid robots.txt file.
Password Generator
Strong random passwords with a live strength meter.
Hash Generator
MD5, SHA-1, SHA-256 and SHA-512 from text or files.
Image & Media
4 toolsEveryday
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Why ToolFeather?
Most online tool sites work, but they watch — loading trackers, dropping cookies, and quietly sending whatever you type to a server. We think a percentage calculator or a JSON formatter has no business collecting your data.
Every tool on ToolFeather runs entirely in your browser, so your numbers, text, images and files never leave your device. We keep no accounts, set no tracking cookies, and store nothing beyond an optional dark-mode preference. That privacy-first, no-nonsense approach is the whole point.