45 free tools · zero uploads
Free tools that work
right in your browser
JSON tools, PDF tools, image converters, Base64 encoders, regex testers, QR codes, and 39+ more — every tool runs locally on your device. No sign-up, no account.
No account · no credit card · nothing ever uploaded
Smart paste — we detect what it is
45
tools, no account
100%
runs on your device
0
files ever uploaded
Free
forever
Built around one rule: your data stays put
No file upload, ever. No account, no tracking — just open a tool and use it.
Your files stay private
Nothing is uploaded. Every tool runs entirely in your browser tab — images, text, documents, all of it.
No account, every tool
Just open any of the 45 tools and switch freely between JSON, PDF, images, finance, and study tools.
Works offline, after first load
Once a tool caches, it keeps working without a connection — on a plane, on a train, anywhere.
Everything included, no account
Every tool below is open the moment you click it — there's no separate plan per category.
JSON
4 toolsJSON Formatter
Format, beautify, and minify JSON instantly in your browser. Syntax highlighting, error detection, sort keys, and one-click Fix. Your data never leaves your device.
JSON Validator
Validate JSON with precise error location and human-friendly explanations. Supports JSON5 and JSONC with comments and trailing commas. 100% client-side.
JSON Viewer
Explore JSON as a collapsible tree with virtualized rendering for 100k+ nodes. Search keys and values, copy JSONPath, and navigate large structures instantly.
JSON Diff
Compare two JSON objects semantically — key-order insensitive. Side-by-side color-coded diff with added, removed, and changed values highlighted clearly.
Converters
6 toolsJSON to CSV
Convert JSON arrays to CSV instantly. Handles nested objects with dot-notation flattening, custom delimiters, and large files via Web Worker. No data uploaded.
CSV to JSON
Convert CSV files to JSON arrays instantly in your browser. Auto-detects headers and delimiters, handles quotes and escaping correctly. Your data stays private.
JSON to YAML
Convert JSON to YAML format instantly in your browser. Clean, readable output with proper indentation. No upload, no account — 100% private.
YAML to JSON
Convert YAML to JSON instantly in your browser. Handles multi-document YAML, anchors, and aliases. Your configuration data stays completely private.
JSON to XML
Convert JSON to XML in your browser. Choose root element name, handle arrays with configurable element names. Zero uploads, zero tracking.
XML to JSON
Convert XML to JSON instantly in your browser. Handles attributes, namespaces, and CDATA sections. Fast, private, and works offline.
Encoders
4 toolsJWT Decoder
Decode JWT headers and payloads instantly. Human-readable claim table, expiry countdown, and optional signature verification via WebCrypto. Token never uploaded.
Base64 Encode
Encode text or files to Base64 in your browser. URL-safe variant, data URI generator, image preview for encoded images. Nothing is uploaded or stored.
Base64 Decode
Decode Base64 strings to text or files in your browser. Auto-detects image data and shows a preview. URL-safe variant supported. Completely private.
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-384, SHA-512, and HMAC hashes for text or files (including files over 1GB). Streaming, private, and 100% browser-based.
Generators
2 toolsQR Code Generator
Generate QR codes for URLs, text, WiFi, email, and more. Customize size, colors, and error correction. Download as PNG or SVG. 100% in your browser.
UUID Generator
Generate UUID v4, UUID v7, ULID, and NanoID in bulk (up to 10,000). Decode UUID timestamps, toggle formatting. 100% client-side, no server calls.
Text and Humanizer
6 toolsRegex Tester
Test regular expressions live with match highlighting, capture group tables, and replace preview. Includes a cheatsheet of common patterns. 100% in-browser.
Diff Checker
Compare two texts side-by-side or inline. Word, character, and line diff modes, ignore-whitespace and ignore-case toggles. Your content never leaves your browser.
Markdown Preview
Write Markdown and see a live rendered preview side-by-side. Copy the output as HTML or raw Markdown. Supports GFM tables, code blocks, and task lists. 100% in your browser.
AI Text Humanizer
Humanize AI-generated text instantly in your browser. Includes on-device AI detection. Models run locally — your text is never sent to any server. Three rewrite modes: Light, Medium, Aggressive.
Grammar Fixer
Fix grammar, spelling, and punctuation mistakes instantly in your browser. A local AI model runs on-device — your text is never sent to any server.
AI Chat
Chat with a real Llama 3.2 language model that runs entirely on your own device via WebGPU. No remote AI service — and web search, when you turn it on, stays limited to just that one query.
Excel
5 toolsFormula Generator
Describe what you want in plain English and get the correct Excel/Google Sheets formula, generated by a local AI model. Runs entirely in your browser.
Formula Explainer
Paste any Excel or Google Sheets formula and get a step-by-step plain-English explanation, generated by a local AI model. Nothing is uploaded.
Messy Data Cleaner
Paste messy tabular data and get consistent values, sensible headers, and duplicate-row flags — reviewed in a before/after preview, exported as .xlsx. Nothing uploaded.
Data → Chart
Turn pasted or cleaned spreadsheet data into a bar, line, or pie chart, then export it as PNG or the underlying data as .xlsx. Fully client-side, nothing uploaded.
Spreadsheet Editor
A real editable spreadsheet grid with a built-in formatting toolbar, multiple sheets, and search/filters, plus AI-assisted formulas, sorting, highlighting, charts, and data insights — all on-device. Nothing uploaded.
Finance
4 toolsReceipt Scanner
Scan receipts and extract merchant, date, total, and category entirely in your browser. On-device OCR and AI — your receipts are never uploaded anywhere.
Invoice Generator
Build professional invoices with line items, tax, and your logo, then export a real PDF — entirely in your browser. Save clients and track paid/unpaid, nothing ever uploaded.
Bank Statement Categorizer
Upload a bank statement CSV and automatically categorize every transaction, spot recurring charges, and see spend-by-category — fully in your browser, nothing uploaded.
Budget Summary Generator
Turn categorized transactions into a short plain-English spending summary, written by a local AI model that only narrates numbers you already calculated — never invents figures.
Study Tools
2 toolsLecture Transcription
Turn a recorded lecture into a readable, paragraph-broken transcript — upload audio or record from your microphone, entirely on-device using an in-browser AI model. Nothing uploaded.
Notes Summarizer & Flashcard Maker
Turn lecture notes or a transcript into a short key-points summary or a set of flashcards — generated by a local AI model running entirely in your browser. Nothing uploaded.
Web
4 toolsSVG Optimizer
Optimize SVG files with SVGO in your browser. Per-plugin checkboxes, before/after size comparison, live visual preview, export as SVG or PNG. No upload.
Timestamp Converter
Convert Unix timestamps to human-readable dates and back. Live current timestamp, auto-detect seconds/milliseconds, timezone selector, ISO 8601 output.
Cron Parser
Parse cron expressions into plain English, see the next 10 run times, and build expressions with an interactive field-by-field UI. Works offline.
Color Converter
Convert colors between HEX, RGB, HSL, OKLCH, and LAB. Live swatch preview, EyeDropper API, and WCAG contrast checker. All in your browser, no upload.
Images
6 toolsImage Converter
Convert images between JPEG, PNG, and WebP formats instantly in your browser. Adjust quality, preview before/after, and download. No upload — 100% private.
Image Resizer
Resize images to exact pixel dimensions in your browser. Lock aspect ratio, choose fit mode, set output format and quality. Your images stay completely private.
Image to Text (OCR)
Extract text from images, screenshots, and scanned documents instantly in your browser. Supports 100+ languages. No upload, completely private.
Image Upscaler
Upscale images 2x or 4x using AI (Real-ESRGAN) — sharper than simple resizing. Runs entirely in your browser. No upload, no account, completely free.
Background Remover
Remove or replace your photo's background, crop it to LinkedIn-ready dimensions, and adjust brightness, contrast, and saturation — all on-device with an in-browser AI segmentation model. Nothing uploaded.
Bulk Image Tools
Resize, compress, convert, and watermark photos entirely in your browser — one at a time for free, or process a whole batch at once and download a .zip. Nothing is ever uploaded.
PDF Editor
Edit PDFs in your browser: add text, draw, highlight, whiteout, and shapes. Export the annotated PDF instantly — nothing is uploaded.
PDF Toolkit
Merge, split, compress, rotate, watermark, number pages, and convert PDFs entirely in your browser — including PDF ⇄ Word. Nothing is ever uploaded.
🔍
No tools match your search.
How it works
Here's exactly what happens when you use a Ghivo tool — no surprises.
01
Paste, type, or drop a file
Your data goes straight into the tool on your screen. Nothing is sent anywhere.
02
Your browser does the work
Everything runs locally — even large files are processed in a background thread so the page stays fast.
03
Copy or download the result
Done. Your data never left your device and nothing was stored on any server.
Ready to try it?
Open any tool — no account, no card, no catch, nothing ever leaves your browser.