Free Online Tools
12 privacy-first tools that run entirely in your browser. Zero data uploads.
ZeroDataUpload's tool collection spans file management, developer utilities, media editing, security, and more. Generate cryptographically secure passwords with UltraPass Pro, convert Unix timestamps across 418 timezones with Epoch Converter, create multi-format favicons for web and mobile, build password-protected ZIP archives with AES-256 encryption, add professional watermarks to images in bulk, and extract text from images using Tesseract.js OCR — all without uploading a single file. Every tool is powered by client-side JavaScript and WebAssembly, which means your data is processed on your own device and never transmitted to any external server. Each tool below includes a detailed feature guide, step-by-step instructions, and a frequently asked questions section to help you get the most out of it.
Epoch Converter Pro
Convert Unix timestamps to dates and back. 418 timezones, batch processing, code generation in 6 languages.
Watermark Studio Pro
Add text and image watermarks to photos with batch processing, presets, and full opacity control.
ArchivePro
Create and extract ZIP files with AES-256 encryption. Drag-and-drop interface, folder support, progress tracking.
Favicon Generator
Generate favicons for all platforms from any image. ICO, PNG, Apple Touch, Android, and PWA manifest ready.
UltraPass Pro
Generate cryptographically secure passwords with customizable length, character sets, and strength analysis.
System Intelligence
Detect your CPU, GPU, RAM, screen resolution, browser details, and network info directly in the browser.
Lorem Ipsum Generator
Generate placeholder text in paragraphs, sentences, or words with instant copy and custom lengths.
Passport Photo Maker
Create passport-sized photos for 70+ countries with cropping, guidelines, and print-ready layouts.
Flip the Coin
Cryptographically fair coin flipper with 3D animations, haptic feedback, auto mode, and streak tracking.
Multi Dice Roller
Roll D4, D6, D8, D10, D12, D20, and D100 dice with 3D physics simulation and cryptographic randomness.
Picture Puzzle
Play jigsaw puzzles in your browser with 3 difficulty levels, custom photo support, and time tracking.
UUID Generator
Generate UUID v1, v4, and v7 with bulk generation, validation, and format conversion tools.
PDF Forge
31 PDF tools: merge, split, compress, convert, sign, watermark, redact, compare — all client-side.
CipherBox
15 text encodings with Morse audio — Binary, Braille, NATO, ROT13, Caesar, Atbash, Pig Latin & more.
Font Converter
TTF, OTF, WOFF, WOFF2 — binary SFNT parsing, zlib/Brotli compression, font preview, glyph grid.
Fancy Text Generator
67 Unicode font styles + 41 decorators for Instagram, Discord, TikTok — one-click copy, zero uploads.
MailShift
Full MIME parser, OLE2 MSG decoder, vCard parser — convert EML, MBOX, MSG, VCF to PDF, CSV, ZIP.
Ebook Converter
EPUB, PDF, FB2, RTF, Markdown — EPUB 3.0 builder, FB2 parser, PDF extraction, all client-side.
DocForge
17 formats, 67 conversion paths, 10 libraries — documents, spreadsheets & images, all client-side.
CurrencyX
30 currencies with live ECB rates, historical charts, volatility analysis, conversion history with CSV export.
ColorForge
6 color spaces, 8 palette types, WCAG contrast checker, image picker, 148 CSS named colors — all client-side.
CodeForge
Convert between 19 data formats — JSON, XML, CSV, YAML, Markdown, SQL INSERT, Base64, Hex, Binary and more.
Encode / Decode
10 text encodings, file-to-Base64, JWT decoder, and 5 hash algorithms — all in your browser.
MORPH Media Converter
Convert audio, video, and images between 34+ formats using FFmpeg WebAssembly in your browser.
Image Converter
HEIC, WebP, AVIF, PNG, JPG — Canvas API pipeline, ICO multi-size builder, quality control, all client-side.
TimeShift
300+ IANA zones, world clocks, meeting planner, timestamp decoder, batch CSV — all DST-aware via Intl API.
Text Case Converter
15 transformations — camelCase, PascalCase, snake_case, kebab-case, Title Case with intelligent tokenization.
DataForge
XLSX, CSV, TSV, JSON, XML — multi-sheet Excel, smart JSON detection, XML flattening, live preview.
OCR Converter
18-language Tesseract.js OCR — extract text from images and PDFs with 6 output formats, all client-side.
BaseShift
6 bases with BigInt precision, bitwise operations, 256-char ASCII table, text encoding, batch conversion.
UnitSwap
201 units, 17 categories — temperature formulas, fuel economy inverse, astronomical & exotic units, all client-side math.