Free browser tools that keep your files on your device

Cron Expression Builder

Build a schedule from fields or paste an expression to read it in plain English, with the next five run times.

curl to Code Converter

Paste a curl command and get working JavaScript fetch, Node axios, Python requests, or Go source.

CSV ↔ JSON Converter

Convert in either direction with custom delimiters, quoted fields, and a file download.

Text Diff Checker

Compare two versions line by line. Additions, removals, and collapsed unchanged regions.

Meta Tag & Open Graph Generator

Fill in a form and see live Google, Facebook, and X previews alongside the markup to copy.

JSON Formatter

Validate, beautify, or minify JSON, with the parse error surfaced when it fails.

Unix Timestamp Converter

Read the current epoch time and convert any timestamp to a readable local date.

File Hash & Checksum

MD5, SHA-1, SHA-256, and SHA-512 for any file or text, plus a verifier for expected checksums.

Password Generator

Cryptographically random passwords from the browser's own CSPRNG, with character-set control.

Favicon & App Icon Generator

One square image becomes every icon size a site needs, resized on your own machine.

Image Compressor & Converter

Trade quality against file size between JPEG, WebP, and PNG with a live before/after readout.

Color Converter

Pick a color and read it back as HEX, RGB, and HSL for pasting into CSS.

Base64 Encoder / Decoder

Encode text to Base64 or decode it back, including full Unicode input.

URL Encoder / Decoder

Percent-encode text for query strings, or decode an encoded URL back to readable form.

Stopwatch

A centisecond stopwatch for timing tasks, with start, pause, and reset.

QR Code Generator

Turn a URL or any text into a scannable QR code, generated locally with a PNG download.

What Is My IP Address

Look up your public IP along with the city, region, and ISP it resolves to.

Uses API Open

DNS Record Lookup

Query A, AAAA, MX, and TXT records for any domain through Google's public resolver.

Uses API Open

Merge PDF

Combine multiple PDFs into one file, in the order you choose. Processed on your device.

Split PDF / Extract Pages

Pull out a page range into a new PDF, or split every page into its own file.

Rotate PDF

Rotate all pages or a range by 90°, 180°, or 270° and download the fixed file.

Images to PDF

Turn JPG, PNG, or WebP images into a single PDF — one image per page, reorderable.

PDF to Images

Render each PDF page as a PNG or JPG and download them in one ZIP.

Extract Text from PDF

Pull the selectable text out of a PDF, page by page, with a .txt download.

Number Base Converter

Convert between binary, decimal, hex and octal instantly — handles huge numbers exactly.

IP Subnet Calculator

Network, broadcast, mask, wildcard, host range and usable hosts from any IP and CIDR prefix.

Bitwise Calculator

AND, OR, XOR, NOT and shifts at 8 to 64-bit width, with two's-complement signed results.

Data Storage Converter

Convert bits, bytes, KB, MB, GB, TB — and the binary KiB/MiB/GiB family — exactly.

Download Time Calculator

How long a file takes at your connection speed — and why Mbps isn't MB/s.

Text ⇄ ASCII / Unicode

Turn text into ASCII or Unicode codes in decimal, hex or binary — and decode them back.

GPA / CGPA Calculator

Credit-weighted GPA on 10-point or 4-point scales, with the common CGPA-to-percentage rule.

Add Watermark to PDF

Stamp a diagonal text watermark like CONFIDENTIAL or DRAFT across every page.

Add Page Numbers to PDF

Number every page — pick the corner, the format (1, Page 1, 1 / 12) and the start value.

Sign PDF

Draw your signature and place it on any page — processed entirely on your device.

JSON ⇄ YAML Converter

Convert config files both ways with proper indentation — handy for Kubernetes and CI files.

UUID Generator

Generate 1 to 1,000 random v4 UUIDs with the browser's crypto — copy or download the list.

Regex Tester

Live match highlighting with flags and capture groups, as you type.

Lorem Ipsum Generator

Classic placeholder text by the word, sentence or paragraph.

JWT Decoder

Decode header, payload and expiry instantly — and verify HS256 signatures with your secret, locally.

SQL Formatter

Turn one-line queries into readable SQL — MySQL, PostgreSQL, SQLite and T-SQL dialects.

HTML / CSS / JS Beautifier

Unminify and re-indent markup, styles and scripts with js-beautify.

Markdown Editor & Preview

Write Markdown and watch it render live — sanitized output you can copy as HTML.

Chmod Calculator

Click permissions or type octal — get 755, rwxr-xr-x and the exact command both ways.

Case Converter

One input, ten cases at once — camelCase, snake_case, kebab-case, Title Case and more.

HTML Entity Encoder / Decoder

Escape text for safe HTML, or turn &-soup back into readable characters.

XML Formatter & Validator

Pretty-print or minify XML and pinpoint the first well-formedness error, with comments and CDATA preserved.

JSON Diff

Compare two JSON documents semantically and list every added, removed and changed value by path, with a JSON Patch export.

JSON Schema Validator

Check JSON against a schema (drafts 2020-12, 2019-09, 07, 04) and list every error with its path, keyword and message.

PDF Page Organizer

See page thumbnails, then drag to reorder, delete, duplicate or rotate pages and save a new PDF.

Crop PDF

Trim page margins in mm or %, preview the crop live, and apply it to every page or just a range.

PDF Metadata Editor

Read and change a PDF's title, author, keywords and dates, or remove the document metadata entirely.

Bulk Image Resizer

Resize a batch of photos by width, height, box or percentage and download them all as a ZIP.

Image Cropper

Crop a photo with a draggable box or exact pixels, lock 1:1, 16:9 or 4:5, rotate or flip, and save at full size.

EXIF Metadata Remover

Find and strip GPS location, camera and date metadata from JPEG, PNG and WebP photos without re-compressing.

SVG to PNG Converter

Render SVG as a crisp PNG, JPEG or WebP at 1×–4× or an exact width, with transparent or solid background.

XML Sitemap Generator

Turn a pasted URL list into a valid sitemap.xml, with per-line checks, lastmod dates and automatic splitting.

Robots.txt Generator & Tester

Build or lint robots.txt, block AI-training crawlers, and test which rule allows or blocks a URL.

UTM Builder

Make GA4 campaign links with utm_source, medium and campaign, with checks for case, spaces and channel grouping.

Schema Markup Generator

Build JSON-LD for Article, FAQ, Product, Event, LocalBusiness and more, checked against Google's required fields.

Date Difference & Age Calculator

Days, weeks and months between two dates, business days with your holidays, and exact age with next birthday.

IPv6 Subnet Calculator

Network, range, exact address count, type and ip6.arpa zone for any IPv6 prefix, plus splitting into smaller subnets.

VLSM Calculator

Divide an IPv4 network into subnets sized by host count, with masks, usable ranges, broadcasts and the leftover free blocks.

IP Range to CIDR Converter

Range to minimal CIDR blocks, CIDR to first and last address, and merge IP lists into the fewest blocks. IPv4 and IPv6.

Port Number Lookup

Search well-known TCP/UDP ports by number, range or service, with IANA vs de facto use and security notes.

SSL Certificate Decoder

Read a certificate or chain: subject, issuer, SANs, expiry, key size, extensions and fingerprints, locally.

Htpasswd Generator

Build .htpasswd files with bcrypt, APR1-MD5 or SHA-1 for Apache and Nginx, and check passwords against existing lines.

Word & Character Counter

Live word, character, sentence and paragraph counts with reading time, keyword density and X/SMS length checks.

Percentage Calculator

X% of Y, X is what % of Y, percentage change, increase or decrease by a percent and percentage difference, with the formula shown.

Image to Base64 Converter

Image to data URI, CSS, HTML or Markdown — and Base64 back to a downloadable image. Type detected from the bytes.

HTTP Status Code Lookup

Search every HTTP status code by number, class or keyword, with causes, fixes, RFC, caching and retry advice.

Docker Run to Compose

Turn docker run commands into a compose.yaml, with named volumes, networks and a list of flags that did not map.

Bcrypt Generator & Verifier

Hash a password with bcrypt at the cost you choose, check a password against a $2a$/$2b$/$2y$ hash, and see what each part means.

WiFi QR Code Generator

Turn a Wi-Fi name and password into a scan-to-join QR code, with PNG/SVG download and a printable card.

Email Header Analyzer

Trace Received hops and delays, read SPF/DKIM/DMARC results and flag phishing tricks in pasted headers.

IOC Extractor & Defanger

Pull IPs, domains, URLs, emails, hashes, CVEs and ATT&CK IDs out of text; refang, defang and export.

CVSS Calculator

Score CVSS v3.1 and v4.0 vectors with base, temporal/threat and environmental metrics, severity and a shareable link.

TOTP / 2FA Code Generator

See and check TOTP/HOTP codes from a Base32 secret or otpauth:// link, measure clock drift, and make a new secret with a QR code.

HMAC Generator & Webhook Verifier

HMAC-SHA1/256/384/512 in hex or Base64, plus signature checks for GitHub, Stripe, Slack and Shopify webhooks.

Key Pair & CSR Generator

Make an RSA, ECDSA or Ed25519 key with its PEM, OpenSSH public key and fingerprint, plus a CSR with SANs, all in your browser.

AES Encrypt / Decrypt

Encrypt text or files with a passphrase (AES-256-GCM, PBKDF2 600k) and decrypt them again, all in your browser.