Privacy-First Browser Tools

A growing collection of 68 privacy-first utility tools that run entirely in your browser. Your files, keys, and inputs never leave your device.

All Tools

Text Diff Checker — Compare two pieces of text side-by-side with additions, deletions, and changes highlighted line-by-line with character-level precision.
Image Diff Checker — Visually compare two images at the pixel level. Difference, side-by-side, and onion-skin overlay modes with adjustable threshold.
JWT Decoder & Verifier — Decode and inspect JSON Web Tokens. Verify HMAC and asymmetric signatures (RS256, ES256, PS256 and more) using the Web Crypto API.
SAML Decoder & Validator — Decode and inspect SAML responses, assertions, and requests. Tabbed breakdown of issuer, status, subject, conditions, attributes, signature, and raw XML.
Email Header Analyzer — Paste raw email headers to visualize the delivery chain, per-hop delays, SPF/DKIM/DMARC authentication results, and a breakdown of every header field.
Clipboard Inspector — Inspect every MIME type and data payload available on paste, drop, or Clipboard API read. See raw types, text, files, and image previews instantly.
TOTP Generator — Generate Time-based One-Time Passwords (RFC 6238) from a Base32 secret. Live countdown, previous and next codes, configurable algorithm, period and digits.
.EML & MIME Email Viewer — Open and inspect .eml and .msg (Outlook) email files. Browse headers, read the HTML or plain-text body, and download attachments.
PDF Merger — Combine multiple PDFs into one document. Drag to reorder pages, remove individual pages, and download a single merged PDF with thumbnail previews.
PDF Splitter — Split a PDF by page range, into equal-sized chunks, or into individual pages. Multi-file output is automatically packaged as a ZIP download.
PDF Page Manager — Reorder, delete, and restore pages in a PDF with drag-and-drop thumbnail previews. Save the rearranged result as a new downloadable PDF.
PDF to Image — Convert PDF pages to PNG or JPEG images at up to 3× resolution. Select individual pages and download them or export all as a ZIP.
HAR Viewer — Inspect HTTP Archive (.har) files with a waterfall chart, request table, headers, payloads, and per-request timing breakdown.
PDF Compressor — Reduce PDF file size with two compression modes. Clean-rewrite strips unused objects; Re-render converts pages to JPEG images for maximum compression.
Image Compressor & Converter — Compress, convert, and resize images to PNG, JPEG, WebP, AVIF, or BMP. Batch processing with quality control, social media dimension presets, and per-file savings badges.
UUID Generator — Generate UUIDs (v1, v3, v4, v5, v7, Nil, Max) with batch generation, namespace hashing for v3/v5, and one-click copy.
Hash Generator (SHA-256, MD5) — Hash text, files, or folders with MD5, SHA-1, SHA-2, SHA-3, BLAKE2b, BLAKE3, and CRC32. Supports HMAC, folder tree manifests, and multiple formats.
AES Encryption & Decryption — Encrypt and decrypt text or files with AES-GCM, AES-CBC, AES-CTR, and RSA-OAEP. Supports password-based and raw key modes with configurable parameters.
JSON, XML & YAML Formatter — Format, validate, and minify JSON, YAML, XML, HTML, CSS, SQL, and TOML. Paste your data, pick a format, and get clean indented output instantly.
SQLite Viewer — Open and explore SQLite database files with an interactive SQL editor. Browse tables, inspect schema, and export query results.
QR Code Generator & Reader — Generate QR codes from URLs, text, Wi-Fi, vCards, email, and SMS. Read QR codes from images. Customize colors, error correction, size, and format.
Regex Tester & Debugger — Test and debug regular expressions with live match highlighting, capture group breakdown, replace mode, and a quick-reference flag guide.
Image to Text (OCR) — Extract text from images using OCR powered by Tesseract.js. Drop or paste any image to get selectable, copyable text in seconds.
Image Redactor — Blur or black-bar sensitive areas in images. Draw redaction regions with your mouse, undo mistakes, and download the result as PNG.
Image Resizer — Resize images by percentage or exact pixel dimensions. Lock aspect ratio, preview estimated file size, and download as PNG, JPEG, or WebP.
Background Remover — Remove image backgrounds using AI, powered by Transformers.js. Drop or upload any photo and download a clean transparent PNG.
Speech to Text Transcriber — Transcribe audio and video files to text in your browser using AI. Powered by OpenAI's Whisper model via Transformers.js.
Parquet Viewer — Open and explore Apache Parquet files. Browse row groups, inspect schema and metadata, filter columns, paginate rows, and export to CSV.
Subnet Calculator — Calculate IPv4 and IPv6 subnet details from CIDR notation. Network address, broadcast, host range, subnet mask, wildcard mask, and more.
Hex & Binary File Viewer — Inspect any file as a hex dump with offset, hex, and ASCII columns. Virtual scrolling, byte selection, search, jump to offset, and a data inspector.
RSA & EC Key Generator — Generate RSA and EC key pairs with JWT, TLS, SSH, and code-signing presets. Optional passphrase encryption. Export as PEM or JWK.
EXIF Viewer — View and remove EXIF metadata from images. Inspect camera settings, GPS coordinates, and timestamps, then download a clean copy with metadata stripped.
PDF Redactor — Permanently redact sensitive text and images from PDFs. Draw black bar or blur boxes over content — pages are re-rendered so no hidden data survives.
PDF Metadata — View and strip metadata from PDFs. Inspect title, author, dates, producer, keywords, custom properties, and XMP, then download a clean copy.
Content Security Policy (CSP) Evaluator — Evaluate Content Security Policy headers for security issues, bypasses, and misconfigurations. Get a graded report with actionable findings.
Unix Timestamp Converter — Convert Unix epoch timestamps to human-readable dates and vice versa. Supports seconds, milliseconds, microseconds, and nanoseconds with live time display.
X.509 Certificate Inspector — Parse and evaluate X.509 / HTTPS certificates. Inspect subject, issuer, SANs, key info, extensions, and get a security grade with detailed findings.
Chrome NetLog Viewer — Inspect Chrome NetLog files exported from chrome://net-export/. Analyze HTTP requests, headers, timings, TLS info, and raw events.
Playwright Trace Viewer — Open and inspect Playwright .zip trace files. Browse actions, screenshots, console logs, and network requests with a detailed timeline view.
PCAP Analyzer — Analyze PCAP and PCAPNG capture files. Inspect packet headers, decode Ethernet, IP, TCP, UDP, DNS, HTTP, TLS, ICMP, ARP, and DHCP layers with hex view.
ASN.1 / DER Structure Decoder — Decode and inspect ASN.1 / DER or BER structures. Paste PEM, hex, or Base64, drop a binary file, and explore the full TLV tree with a synced hex view.
CORS & Security Headers Evaluator — Evaluate CORS and HTTP security headers for misconfigurations and vulnerabilities. Paste response headers to get a scored security posture report.
Nmap Report Viewer — Parse Nmap XML and gnmap scan reports. Browse hosts, ports, services, OS detection, and NSE script output with search, filtering, and CSV export.
PDF Protector — Add or remove PDF password protection. Encrypt with AES-256, AES-128, or RC4, set granular permissions, or unlock protected PDFs.
PDF Signature Placer — Add a drawn or uploaded signature image to any page of a PDF. Drag to position, resize freely, and download the signed document — no printing or scanning required.
CSV / TSV Viewer — Open and explore CSV, TSV, and delimited text files. Column sorting, full-text search, delimiter auto-detection, type inference with stats, and CSV export.
Cron Expression Parser — Parse cron expressions into plain English with next execution times, weekly heatmap, and interactive builder. Supports Unix and Quartz syntax.
Password Generator — Generate random passwords, passphrases, and PINs. Configurable length, character sets, ambiguous exclusion, entropy meter, and batch generation.
Base64, URL & Hex Encoder — Convert between Base64, hex, URL encoding, HTML entities, Unicode escapes, ROT13, binary, Morse, and Punycode. Auto-detects format with batch mode.
Color Converter & Contrast Checker — Convert between HEX, RGB, HSL, HSV, OKLCH, and CMYK. WCAG 2.1 contrast checker with AA/AAA badges, palette harmonies, and color blindness simulation.
SSH Key Inspector — Parse and security-grade SSH keys. Inspect key type, bit size, and fingerprints for RSA, Ed25519, ECDSA, and DSA from authorized_keys and PEM files.
OpenPGP Suite — Generate PGP key pairs, encrypt and decrypt messages, sign and verify text, and inspect keys. OpenPGP standard (RFC 9580) with Curve25519 and RSA.
Checksum Verifier — Drop a file to compute MD5, SHA-1, SHA-256, and SHA-512 checksums, then paste an expected hash to instantly verify file integrity.
String Escape & Unescape — Escape and unescape strings for JSON, HTML, XML, URL, CSS, regex, shell, SQL, C/Java, and LaTeX contexts with real-time conversion.
Image Cropper — Crop images with a draggable selection box. Aspect ratio presets (1:1, 16:9, 4:3, 3:2, free), pixel-precise inputs, and export as PNG, JPEG, or WebP.
Barcode Generator — Generate 1D and 2D barcodes: Code 128, Code 39, EAN-13, UPC-A, ITF, Codabar, Data Matrix, and PDF417. Customize colors and download as SVG or PNG.
ISO 8601 Duration Parser — Parse, validate, and build ISO 8601 duration strings. Human-readable breakdown, conversion to seconds, timeline generator, and interactive builder.
DNS Zone File Inspector — Parse and inspect BIND-style DNS zone files. View A, AAAA, CNAME, MX, TXT, SOA, NS, SRV, and CAA records with sorting, filtering, and validation.
Protobuf Decoder — Decode Protocol Buffer binary data with wire-type inference or a .proto schema. Tree view of fields, types, and decoded values with multiple interpretations.
Rich Text & HTML to Markdown Converter — Convert rich text from Google Docs, Word, or Notion — or raw HTML — to Markdown and Jira/Confluence wiki markup. Headings, lists, tables, code blocks, and more.
HTTP Request Builder & Encoder — Compose HTTP requests and generate curl commands, fetch() code, Python requests snippets, and raw HTTP/1.1 text. Decode a curl command into editable fields.
Key Derivation (HKDF / PBKDF2) — Derive cryptographic keys using HKDF (RFC 5869), PBKDF2, or scrypt from a passphrase or input keying material. Configure salt, info, iterations, and output length. Show intermediate PRK values for HKDF.
JSON Diff — Local Only Tools — Semantically compare two JSON documents with structural awareness. Detect added, removed, and changed keys, type changes, and nested objects and arrays with a tree view and changes-only summary.
JSON ↔ YAML ↔ TOML Converter — Local Only Tools — Convert between JSON, YAML, and TOML configuration formats instantly. Paste in one format, get the equivalent output in another with syntax highlighting and validation.
Image Watermark — Add text or image watermarks to photos. Configure position, opacity, rotation, font, and size. Batch-process multiple images and download as PNG or JPEG.
Number Base Converter — Convert integers between decimal, hexadecimal, octal, binary, and arbitrary bases (2–36). Live simultaneous conversion as you type with BigInt support and bit-level binary visualization.
Timestamp Format Converter — Convert date and time between ISO 8601, RFC 2822, RFC 3339, HTTP-date, Unix epoch, Windows FILETIME, .NET ticks, Go reference format, and strftime patterns with auto-detection.
Unix Permissions Calculator — Convert between symbolic (rwxr-xr--), octal (754), and human-readable Unix file permissions. Interactive checkbox grid, special bits (setuid, setgid, sticky), and generated chmod commands.

All processing happens locally in your browser. No data is ever transmitted.