Tools

Batch image processor

Build a reorderable workflow from crop, background removal, resize, rotation, compression, conversion, watermarking, colour adjustment, and metadata removal, then run it across images, folders, or ZIP files.

Crop image

Crop several images freehand or by exact pixels, with common and custom ratios, composition guides, straightening, 90° rotation, flipping, per-image review, and batch export.

Split image

Cut images into grids, fixed-size tiles, long-image sections, or manually placed guides for social grids, web captures, print slices, and asset extraction.

Image Studio

Start with images, a folder or a ZIP. Choose compression, cropping, resizing, format conversion, watermarks or redaction, then pass the results to another tool. Your images stay in your browser.

Stitch images

Arrange images by drag order and combine them vertically, horizontally, or in a grid with controllable gaps, alignment, and sizing, while previewing the complete composition.

Resize image

Resize JPG, PNG, WebP, and AVIF images in batches by dimensions, percentage, long or short edge. Fit, crop, pad, prevent enlargement, and create multiple sizes locally in your browser.

Extend image canvas

Add independent padding around an image without cropping it, choose the image anchor, and export with a transparent or solid-colour canvas.

Social media image resizer

Create Instagram, Stories, Open Graph, X, and YouTube sizes in one pass, with safe-area guides that help keep important content clear of interface overlays.

Compress image

Compress JPG, PNG, WebP, and AVIF images in batches with smart optimisation, a target KB limit, or manual quality and dimension controls. WASM encoding runs locally in your browser.

Convert image format

Batch-convert JPEG, PNG, WebP, AVIF, still GIF frames, and HEIC for free, with several formats per image and private local processing.

Image and Base64 converter

Convert image files to Data URLs and decode image Data URLs back to files, with a copyable text result and a downloadable image preview.

Edit image

Rotate, flip, and apply practical tonal adjustments with undo and redo for quick corrections that do not need a layered graphics editor.

Add an image watermark

Apply text or image watermarks to a batch and control position, size, angle, opacity, outline, shadow, background, and tiled repetition.

Redact faces and private details

Redact faces, number plates, IDs, addresses, QR codes, and screen details locally in batches with rectangles, ellipses, a brush, reviewable face suggestions, solid cover, pixelation, and blur.

Adjust image colours

Tune exposure, brightness, contrast, saturation, hue, temperature, gamma, sharpness, and blur while using a histogram and same-size comparison to judge the result.

Image colour picker

Sample any pixel as HEX, RGB, HSL, and alpha, then extract dominant colours and their shares for design, branding, and visual analysis.

Replace an image colour

Sample and replace a colour with adjustable tolerance and edge feathering, preserve luminance when needed, or make the selected colour transparent.

Compare images

Inspect two images with slider, side-by-side, flicker, and single-image views, then calculate changed pixels, change percentage, and mean pixel error.

View and remove image metadata

Inspect dimensions, format, capture details, dates, and GPS metadata, highlight privacy risks, and export a re-encoded copy with metadata removed.

Find duplicate images

Find exact copies with file hashes and visually similar images with perceptual difference hashes, then recommend a version to keep by resolution and file size.

Create GIF from images

Turn ordered still images into a GIF with per-frame delays, loop count, colour count, dithering, and compression controls.

Extract GIF frames

Read a GIF timeline and export frames by start, end, and interval while preserving timing information for inspection or reuse.

Edit animated GIF

Edit frame range, order, speed, dimensions, crop, and rotation, then control colour quantisation and dithering for the exported animation.

Compress GIF

Reduce GIF size through frame sampling, resizing, palette size, playback speed, dithering, and lossy compression while balancing motion and quality.

GIF to sprite sheet

Lay out GIF frames as a sprite sheet and export frame coordinates for web animation, game assets, or front-end packaging.

Images to PDF

Combine ordered images into a PDF with page size, orientation, and margin controls for scans, receipts, assignments, and portfolios.

Favicon and app icon generator

Generate favicon, PWA, and common app-icon sizes from one source, with safe-area and background controls plus a web app manifest.

Image placeholder generator

Create BlurHash, ThumbHash, and tiny-image placeholders for a stable lightweight preview while the full image loads.

Sprite sheet maker

Pack small images into a sprite sheet with configurable columns and gaps, and export JSON coordinates plus CSS background positions.

Remove image background locally

Remove backgrounds locally with a fast portrait model or a finer general model, then reuse the mask with transparency, a solid colour, or another image.

Image to text (OCR)

Recognise Simplified Chinese, Traditional Chinese, or English text locally and export readable text plus structured JSON with confidence data.

Document photo scanner

Detect and refine page corners, correct perspective, apply colour, greyscale, or black-and-white enhancement, and optionally combine pages into a PDF.

Upscale image

Use local Real-ESRGAN inference to double image width and height; the verified model is cached after its first download and the page shows the current device limit.

ID photo maker

Prepare ID photos with composition guides, cropping, sizing, optional background replacement, and file-size control; local face detection remains a suggestion for manual approval.

China passport photo

Check and prepare dimensions, composition, format, and file size against the China passport preset, then verify current requirements with the receiving authority.

China identity card photo

Assist with composition, dimensions, and file checks for China identity-card photos without replacing official capture or acceptance review.

China teacher qualification exam photo

Prepare composition, dimensions, format, and file size for China’s teacher qualification exam photo upload and reduce avoidable file-validation failures.

China civil service exam photo

Follow a guided preset for China civil service exam photos, covering composition, pixels, format, and file size with clear manual checks.

Hubei social security card photo

Check composition, dimensions, format, and size against the Hubei social security card preset, subject to the latest official collection rules.

U.S. visa photo

Assist with square crop, head placement, dimensions, and file checks based on published U.S. visa photo rules; official review remains decisive.

U.S. passport photo

Check the file format of a U.S. passport photo and view the original. No editing or automatic assessment of head proportions, background or recency.

UK passport photo checker

Check a UK digital passport photo’s pixel dimensions, JPEG format and file size locally. Keep the original for your application.

Canada permanent resident photo

Check pixel dimensions, JPEG format and file size for a Canadian PR digital photo. Review composition and photography requirements separately.

Japan visa photo

Prepare crop, composition, dimensions, and file output for a Japan visa photo preset, then confirm recency and background rules with the relevant mission.

Merge PDF files

Merge PDFs locally, reorder files and choose a page range for each document before exporting a new PDF.

Split PDF

Split a PDF into page groups or individual pages, then download each result or a ZIP containing all parts.

Rotate PDF pages

Rotate selected PDF pages by 90°, 180° or 270°, leaving the other pages unchanged, and export a new document.

Organize PDF pages

Reorder, extract, duplicate or remove PDF pages using a custom page sequence, then export the arranged document.

PDF metadata editor

Read and edit a PDF’s title, author, subject and keywords locally, then preview and download the updated document.

PDF to JPG and PNG converter

Convert selected PDF pages to JPG or PNG, choose resolution, preview exported images and download them individually or as ZIP.

Extract text from PDF online

Read a PDF’s text layer locally, select pages, copy page-separated text and download TXT, with clear notices for pages that need OCR.

Add PDF page numbers and text watermarks

Stamp one PDF or a batch with page numbers and a multilingual text watermark, with page ranges, positioning and real output previews.

JSON Formatter

Format, minify and validate JSON without changing large integers, number notation, key order or string escapes. Import files and locate syntax errors.

Timestamp Converter

Convert Unix seconds or milliseconds into local, ISO, and UTC time.

HTML Editor

Edit HTML, CSS, and JavaScript with a network-enabled sandbox preview.

Text to Base64 converter

Convert UTF-8 text to Base64 and back instantly, with standard and URL-safe formats and full support for Unicode and emoji.

URL encoder and decoder

Encode URL parameters or full URIs and decode percent escapes, with explicit handling of spaces, plus signs and Unicode.

HTML entity converter

Escape HTML special characters or decode named and numeric entities. Optionally encode non-ASCII characters as numeric entities.

Unicode escape converter

Convert readable text to Unicode escapes and back, including UTF-16 pairs, code point escapes, emoji and common control characters.

JWT decoder

Inspect a JWT header and payload separately, and read issued-at, not-before and expiry claims as UTC dates.

Text hash calculator

Calculate SHA-256, SHA-384, SHA-512, SHA-1 and MD5 hashes of UTF-8 text, with a copy button for each result.

File checksum checker

Calculate a file checksum locally and compare it with an expected value to check a download or a transferred file.

HMAC calculator

Calculate HMAC-SHA-256, SHA-384 or SHA-512 using a text or hexadecimal key, useful for checking API signature inputs.

UUID generator

Generate RFC 9562 UUID v4 or v7 values in batches, with uppercase output, individual copying and text download.

Random password generator

Generate secure random passwords with your choice of length and character groups, optionally excluding look-alike characters.

Regular expression tester

Test JavaScript regular expressions, inspect match positions and capture groups, and preview text replacements as you type.

CSV to JSON converter

Convert CSV or TSV to JSON and back, with quoted fields, embedded newlines, Unicode and a table preview.

XML formatter and validator

Validate and format XML locally with two- or four-space indentation, preserving mixed text and xml:space whitespace.

chmod permission calculator

Set read, write, execute and special permission bits using a matrix or octal value, with live Linux symbolic permissions.

JSON Pointer query

Find and extract a JSON value by its path, browse available paths and preserve large numbers exactly.

JSON structure comparison

Compare JSON values and types independently of object key order, with precise paths for added, removed and changed data.

JSON to TypeScript types

Infer TypeScript types from JSON samples, including nested objects, optional properties, arrays, unions and null.

Text to hex and binary

Convert UTF-8 text to hexadecimal or binary bytes and decode bytes back to readable text, including Unicode and emoji.

Base32 encoder and decoder

Convert UTF-8 text to standard Base32 or Base32hex and back, with optional padding and strict decoding.

Gzip text compressor

Compress text to gzip, display compressed data as Base64, restore UTF-8 text and download a real .gz file locally.

Cron expression checker

Inspect a five-field Unix cron expression and see its upcoming execution times in UTC and your local time.

Word and character counter

Count characters, words, lines, paragraphs and UTF-8 bytes as you type, with support for combined characters and emoji.

Text case converter

Change letter case or convert names to camelCase, PascalCase, snake_case and other common identifier styles, including Unicode text.

Text line organizer

Remove duplicate or blank lines, trim whitespace, sort naturally and add a prefix or suffix to every line, with instant preview.

Text diff checker

Compare two texts line by line, see added and removed content with line numbers, and download the differences.

Find and replace text

Replace literal text with a live result, match count, case sensitivity and whole-word matching, then copy or download it.

List intersection and difference

Compare two lists to find shared entries, unique entries, their union or symmetric difference, with optional text normalization.

Word frequency counter

Rank words or visible characters by frequency, filter the results and export counts and percentages to CSV.

Extract URLs, emails and numbers

Pull web addresses, common email addresses or numbers out of text, optionally remove duplicates and download the list.

Markdown table editor

Paste spreadsheet cells or import CSV / TSV, edit rows and columns, and export a Markdown table or CSV without losing leading zeros.

Text file encoding converter

Read legacy text files, fix encoding mismatches and export UTF-8 or UTF-16 with your choice of BOM and line endings.

Color format converter

Convert HEX, RGB and HSL colors with alpha transparency, preview the swatch and copy ready-to-use CSS color values.

Color contrast checker

Check WCAG 2.2 text contrast with a live preview and separate AA and AAA results for normal and large text.

CSS gradient generator

Build linear or radial gradients with two to eight editable color stops, a live preview and copyable CSS.

CSS box shadow generator

Adjust offset, blur, spread, color and opacity with a live preview, then copy a box-shadow declaration for an outer or inset shadow.

Aspect ratio calculator

Simplify an image or video aspect ratio and calculate the matching width or height for a target size, with a visual preview.

CSS Grid layout generator

Build a grid visually with fixed or responsive columns, adjust gaps and alignment, and copy matching CSS and HTML.

CSS Flexbox layout generator

Explore flex direction, wrapping, spacing and alignment in a live layout, with ready-to-copy CSS and HTML.

Color palette generator

Create complementary, analogous, triadic or monochromatic palettes from a base color and export HEX values, CSS variables or JSON.

CSS border-radius generator

Adjust linked or independent corner radii, preview elliptical corners and export border-radius CSS.

CSS polygon clip-path generator

Shape a polygon with draggable or numeric control points and export its live clip-path preview as CSS.

CSS cubic-bezier easing editor

Edit two curve control points, test the transition and export a cubic-bezier easing function.

Fluid font-size clamp() generator

Create responsive font-size CSS from size and viewport limits, with px/rem output and a live size preview.

CSS image filter generator

Preview blur, brightness, color and opacity filters on a sample or local image, then export the filter CSS.

CSS 2D and 3D transform generator

Preview translation, rotation, scale, skew and transform origins, with optional perspective and 3D controls.

Paper sizes and print pixel calculator

Look up A, ISO B, C, Letter, Legal and Tabloid sizes, then calculate pixels, inches and points with orientation and bleed.

SVG optimizer and PNG converter

Clean and optimize SVG files, compare their size and appearance, then download SVG or export a PNG with custom dimensions and a transparent or solid background.

Number base converter

Convert integers exactly between bases 2–36, including negative and very large values, with common base results shown together.

Unit converter

Convert length, mass, area, volume, temperature, speed, data size and time, with editable values on both sides.

Percentage calculator

Find a percentage of a number, calculate what share a part represents, or measure the percentage change between two values.

Date difference calculator

Count calendar days between dates, or add and subtract days from a date, with an option to skip weekends.

Number list statistics

Calculate an exact decimal sum, mean, median, minimum, maximum and population or sample standard deviation for a list of numbers.

Fraction calculator

Add, subtract, multiply or divide fractions exactly, then see the reduced fraction, mixed number and decimal approximation.

Add and subtract durations

Total time entries without wrapping at 24 hours, subtract durations and convert the result to seconds, minutes or hours.

Random integer generator

Generate random integers in an inclusive range, with unique results, sorting and support for numbers beyond JavaScript’s safe integer range.

Stopwatch and countdown timer

Measure elapsed time with laps or set a countdown, pause and resume, and export lap records to CSV.

IPv4 subnet calculator

Calculate the network, broadcast, usable address range and host count from an IPv4 address with a CIDR prefix or subnet mask.

URL parser and query editor

Inspect URL components and edit query parameters without losing repeated names, their order or the URL fragment.

IPv6 subnet calculator

Expand or compress an IPv6 address and calculate its CIDR network, final address and exact address count for prefixes 0–128.

DNS record lookup

Query DNS records with Cloudflare or Google and inspect TTLs, response codes and the resolver’s DNSSEC flag.

IP range to CIDR

Convert an inclusive IPv4 or IPv6 address range into the smallest set of CIDR blocks, with exact address counts.

VLSM subnet planner

Plan IPv4 subnets by host count, inspect usable ranges and free blocks, and export the allocations as CSV.

MAC address formatter

Convert MAC addresses between common formats, inspect address bits and generate locally administered unicast addresses.

Domain Punycode converter

Convert internationalized domain names between Unicode and ASCII, with per-line validation and CSV export.

HAR network viewer

Inspect HAR 1.2 requests, timings and headers locally, then export the complete filtered request list as CSV.

UTM campaign URL builder

Build campaign links with seven UTM fields while retaining other query parameters and URL fragments.

BriefInk

Signed-in users

A Markdown notebook with local persistence, import/export, and optional AI summaries.

ZIP files and folders online

Create ZIP archives, browse their contents and extract selected files locally, with folder paths and integrity checks.

Time zone converter and meeting planner

Compare dates and times across up to eight regions, handle daylight saving changes and download a calendar event.

QR code generator and image reader

Create QR codes for text, links, Wi-Fi and contacts. Download PNG or SVG, or read a code from an image without opening its link.

Excel and CSV cleaner

Choose a worksheet, keep the columns you need, remove blank or duplicate rows, and export CSV or XLSX while preserving displayed values as text.

SRT / VTT converter and subtitle time shift

Convert between SRT and WebVTT, extract subtitle text, adjust timings and combine files with a timeline preview, all in your browser.