1,070+ Privacy-First Tools
Most tools run in your browser with zero uploads. Cloud-dependent tools are clearly marked on every tool page.
All Tools
804 tools shown · 1,070+ total.gitignore Generator
Generate .gitignore files by selecting languages, frameworks, and tools from a checklist — covers Node, Python, Java, Go, Rust, macOS, Windows, Linux, and popular IDEs. Supports negation patterns and custom rules.
30/40/30 Macro Split
Split calories into protein, carb, and fat grams for any diet target. Turn 2000 kcal into exact macros — free, local, no signup.
A/B Test Calculator
Check A/B test significance — conversion lifts that are real vs noise. Stop shipping coin flips — free, local, no signup.
Aadhaar Card Masker
Manually black out the first 8 digits of your 12-digit Aadhaar number on card images by drawing boxes — download the masked copy. Fully local processing.
Aadhaar Number Validator
Validates Aadhaar numbers using Verhoeff checksum verification. Checks format rules, detects fake UIDs, and explains Aadhaar number structure. Fully local validation with no data upload.
Aadhaar Wallet Cropper
Crops Aadhaar card scans to the standard 86 x 54 mm card size with manual slider positioning and front/back sides. All processing is local and private.
Add Image to PDF
Insert images (PNG, JPG) onto any page of your PDF document. Position and resize images anywhere on the page. Perfect for adding signatures, logos, or photos to documents.
Add Page Numbers to PDF
Inserts page number labels at user-chosen positions (bottom-center, top-right, etc.) with configurable font, size, and starting offset. Documents stay on your device — editing and conversion run locally in your browser.
Add Text to PDF
Type directly onto any PDF page — fill forms, add notes, stamp corrections without printing. Complete a 3-page application in minutes — local pdf-lib editing, unlimited saves.
Add Text to Photo
Add one custom text caption onto a photo with color, size (10–300px slider), and X/Y position controls, composed on fixed social-size canvases — Instagram Post 1080×1080, Reel 1080×1920, YouTube Banner 2560×1440, Twitter Header 1500×500, or Custom. Exports PNG locally in your browser on Canvas; 3 free downloads a day.
Advanced PDF Tools
Overlay one PDF on another, alternate-merge two documents, combine pages into sheets, apply booklet layout, invert colors, or extract pages as ZIP images.
AES Encrypt
Encrypt text using AES symmetric encryption with a passphrase. Generate ciphertext that can be safely transmitted or stored. Code never leaves your device — formatting and validation run locally in your browser.
Age Calculator
Computes exact age in years, months, and days from a given birth date relative to any target date. Numbers never leave your device — every calculation runs locally in your browser.
AI Background Changer
Remove and replace image backgrounds with edge-aware detection — no green screen needed. Sellers shoot product photos on any table, then swap to clean white. Runs locally on canvas — free to start, fair limits.
AI Chat PDF
Chat with any PDF: ask questions, get answers, and extract insights with intelligent in-browser search. Students quiz a textbook chapter in minutes — free to start.
AI Cover Letter Generator
Turn a job description plus your resume into a tailored cover letter that mirrors the employer's keywords. Applicants generate a first draft in a minute — 1 credit per letter, sign in free for 5.
AI Detector
Score text for AI authorship with burstiness, repetition, and trigger-phrase analysis — percentage plus per-section breakdown. Teachers screen a 2,000-word essay in seconds — runs locally, free to start with fair limits.
AI Document Chat (RAG)
Chat with PDFs, Word files, and text docs using RAG: files index into a vector store and you ask natural-language questions. Researchers query 50-page reports in seconds — sign in free, 1 credit per answer.
AI Humanizer
Rewrite stiff AI-sounding text into natural human-like prose in 5 tones — casual, professional, friendly, natural, storytelling. Bloggers convert robotic drafts into readable posts — runs locally, free to start with fair limits.
AI Image Generator
Turn text prompts into high-resolution images with three engines: free Pollinations drafts, 1-credit FLUX drafts, and 5-credit Gemini HD for Pro. Designers prototype hero art in seconds — free to start, sign in for credits.
AI Paraphrasing Tool
Rewrite sentences and paragraphs while preserving meaning — students, writers, and marketers rephrase drafts in 4 tones (Standard, Fluent, Formal, Creative). Runs on AI text generation at 1 credit per rewrite — sign in free for a 5-use trial.
AI Thumbnail Maker
Design click-optimized YouTube thumbnails by compositing bold text, cutout images, and effects on a 1280x720 smart canvas. Creators A/B-test two variants per video — runs locally, free to start with fair limits.
AI Translator
Translate text between 16 languages with automatic source detection via the AI API. Bloggers localize a 500-word post in seconds — 1 credit per translation, sign in free for 5.
Algebra Calculator
Evaluate arithmetic algebra expressions with + − × ÷, parentheses and decimals — digits-only evaluator, no variables. Check homework before class — free, local, no signup.
Annual Contract Value Calculator
Compute Annual Contract Value by dividing total contract value by contract years — know deal size trends. Track enterprise motion quarterly — free, local, no signup.
API Builder & Tester
Send HTTP requests from your browser — custom headers, bodies, params, saved collections, and one-click cURL/Fetch/Axios snippets. Developers debug a REST endpoint without leaving the tab — runs locally, free to start.
API Changelog Generator
Generate structured changelogs from API version diffs. Categorize changes as Added, Changed, Deprecated, Removed, Fixed, or Security.
API Cost Estimator
Estimate API bills from request volumes and price-per-million — OpenAI and Stripe presets included. Forecast a 1M-request month before committing — local math, free, no signup.
API Diff Checker
Compare two OpenAPI specs side-by-side to detect breaking changes, new endpoints, removed fields, and modified schemas between versions.
API Documentation Generator
Turn endpoint descriptions into clean API docs with parameters, responses, and curl samples. Document as you build, not after — local generation, free, no signup.
Free tools that run in your browser
Toolzum is 1070+ free utilities for PDF, images, video, audio, AI, text, and code. Most run entirely on your device: your file loads into browser memory, gets processed locally, and downloads straight back — nothing uploaded, no account needed to start. Tools that need the network (AI answers, live lookups, currency rates) are clearly marked, so you always know what leaves your device before you run anything sensitive.
Find tools three ways: search above by task, browse by file format, or compare formats head-to-head in comparisons. Every ceiling is listed honestly on the limits page, offline behavior on the offline page, and the privacy model — with a recipe to verify it yourself — in the Trust Center.