All tools
Filter every available tool by keyword, task or category. Most tools process files in your browser without uploading them.
82 tools
Documents & Office19
Images to PDF
Drop images, put them in order and get one PDF. Choose page size, orientation and margins; phone photos are rotated correctly. Images are converted on your device and never uploaded.
Compress PDF
Drop a PDF to cut its size. Only photos and scans are recompressed, so text and graphics stay crisp. Your PDF is processed on your device and never uploaded.
PDF Editor
Lay text (Japanese included), shapes, arrows, a highlighter, freehand drawing and images on top of a PDF, and fill in its form fields. Everything is written as PDF vectors and real text, never as a picture. Rewriting the original text and true redaction are not possible.
PDF Extract
Take the text, images, links, attachments, form values and bookmarks embedded in a PDF, for the pages you choose. Images stay as embedded (JPEG untouched). Your PDF never leaves your device.
Extract PDF Pages
Gather just the pages you need from one or more PDFs into a single PDF (or one PDF per source file in a ZIP). Pick by thumbnail, range or text search, and leave out blank pages automatically. Your PDFs are processed on your device and never uploaded.
Merge PDF
Drop several PDFs, put them in order, and get one PDF. You can also choose which pages to take from each file. Nothing is uploaded — merging happens on your device.
PDF Metadata Cleaner
Before you share a PDF, see and remove the hidden personal data in it: author name, comment authors, attachments and more. Compare items before and after, and process many files at once. Nothing is uploaded.
Organize PDF Pages
Drag thumbnails to reorder pages, and rotate, delete, duplicate or insert blank pages — all visually. Your PDF is processed on your device and never uploaded.
Sign & Stamp PDF
Add handwriting, Japanese-style seals (round, square, date), images or text to a PDF at real size in millimetres. It is a visual mark, not a certificate-based digital signature, and your PDF never leaves your device.
Split PDF
Pick pages from thumbnails to extract them, or split a PDF by ranges, every N pages or into single pages. Your PDF is processed on your device and never uploaded.
PDF Target Size
Pick a target (under 1 MB, for example) and drop a PDF. The tool looks for the highest image quality that fits and shrinks images only if it must. Sizes are counted as 1 MB = 1,000,000 bytes, so the file fits whichever way the site counts. Your PDF never leaves your device.
PDF to Images
Turn PDF pages into PNG, JPEG or WebP images. Pick the resolution (72–300 dpi) and pages, then save them all as a ZIP. Your PDF never leaves your device.
PDF Watermark & Page Numbers
Add watermarks (text or a logo), page numbers and Bates numbers to PDFs. Japanese watermarks work and the text in the exported PDF stays selectable. Your PDFs are processed on your device and never uploaded.
Image OCR
Read Japanese and English text from images and turn it into editable text. Process several images at once, then copy the text or save it as a .txt. Your images never leave the browser.
Office Size Inspector
Find out what makes a Word, Excel or PowerPoint file heavy: a breakdown by images, video, fonts, embedded objects, XML and more, with every picture’s resolution compared with how large it is shown and where it is used. Then make a lighter copy while the original stays unchanged. Files are never uploaded.
Phone Photo to Scan PDF
Take a photo of a page or pick one. The corners are found automatically, the page is flattened to a straight-on view, shadows are removed, and pages are combined into one PDF. Photos never leave your device.
Word Studio
Read a .docx on a PC or phone without Word, then take the body out as text, Markdown or HTML. It offers a contents list, character counts and one-click picture extraction. The file is never uploaded, and the page layout is not reproduced.
PDF Password
Add a password to open your PDF and encrypt it with AES 256-bit. If you forget the password nobody can open the file, so note it down before saving. Neither the PDF nor the password ever leaves your browser.
PDF Unlock (Known Password)
Remove the open password and the editing, printing and copying limits from a PDF whose password you know. Use it on your own files or files you are authorised to open. It cannot guess or crack passwords, and your PDF is never uploaded.
Spreadsheets & Data9
CSV Encoding Fix
Convert CSV files that show garbled text in Excel to UTF-8 with BOM or Shift_JIS, with automatic encoding detection. Mojibake that was already saved, such as “日本語”, can usually be restored too.
CSV Studio
Open CSV files that are slow or garbled in Excel and view, search and edit them right away in your browser. Combine, split and save as CSV (UTF-8 with BOM, Shift_JIS), Excel or JSON on one screen.
CSV, JSON, XML & Excel Converter
Convert between CSV, TSV, JSON, JSON Lines, XML and Excel (.xlsx) by pasting or opening a file. Values stay as text by default, so zero-padded postal codes, phone numbers and long IDs are never changed. Everything runs in your browser; your data is not uploaded.
Data Health Check
Open a CSV or Excel table to get a list of problems — blanks, duplicates, spelling variants, garbled text and more — ranked by severity, a 0–100 health score and a profile of every column. Click a finding to see the affected rows; fixable problems link to the right tool.
Excel Cleanup
Tick what to fix and clean up spaces, character widths, dates and numbers across a whole Excel or CSV file at once. Changed cells are highlighted, and you can save as Excel or CSV.
Excel Compare
Load an old and a new Excel or CSV file to see added, removed and changed rows, with every changed cell shown as “old → new”. Save the result as a colour-coded Excel report or CSV.
Excel Deduplicate
Find duplicate rows in an Excel or CSV file by the columns you choose, ignoring the variations you choose, then remove them or merge each group into one row. Review every group, change which row survives, and save as Excel or CSV.
Excel Merge
Combine sheets from several Excel or CSV files: stack their rows into one table, or keep them as separate sheets in one workbook. Columns are aligned by header name automatically.
SQL Studio — Format, Analyze & Convert
Paste SQL to format, minify or analyze it for your dialect. Strings and comments are never altered, UPDATE/DELETE without WHERE and DROP are flagged, and value lists or CSV rows become IN clauses and INSERT statements — all on your device.
Images & Design11
Icon Generator
From one image (or a letter or emoji), get favicon.ico, apple-touch-icon, Android/PWA icons, a maskable icon and an OGP image, plus the manifest and the <head> code to paste. Check blur at real size first — nothing leaves your browser.
Batch Image Resizer
Drop a batch of images and resize them by width, longest edge, box crop and more. Make several sizes (say 320, 640 and 1280) from each image in one go, then copy ready-made srcset HTML. Your images are never uploaded.
Image Compressor
Drop images to shrink them in bulk while keeping them sharp. Convert to WebP or AVIF, resize, and compare before and after. Your images are never uploaded.
Image Converter
Choose the target format first, then drop images to convert them in bulk. Tune quality per format, use lossless WebP, set a background for transparency and name the output files — nothing is uploaded.
Crop, Pad & Canvas
Drag to crop, then rotate, straighten and add padding on one screen. Export straight to the recommended X header or Instagram size. Your image is never uploaded.
Image Editor
Annotate a screenshot or photo, reliably hide what must not be seen, tune the colours and export — on one screen. Made for how-to guides, bug reports and social posts. Your image is never uploaded and exports carry no metadata.
EXIF & GPS Remover
Remove the location (GPS), camera details and timestamps embedded in your photos without touching image quality. Inspect what was inside and verify the result — all in your browser.
Color Converter, Contrast Checker & Palettes (Color Studio)
Type one color and see it in HEX, RGB, HSL, HWB, OKLCH and approximate CMYK. Check WCAG contrast against a background (AA/AAA), generate complementary or triadic schemes and a 50–950 OKLCH scale, preview how a palette looks with color-vision deficiency, and export CSS variables or Tailwind config. Nothing leaves your device.
Image Merge & Contact Sheet
Put your images in order and merge them into one picture: stacked, side by side, in a grid or as a contact sheet. The output size is shown before you create it, and images never leave your device.
Image Target Size
Pick a limit like “under 200 KB” and get the best-looking JPEG or WebP that fits. Quality is lowered first; pixels are reduced only if that is not enough. Nothing is uploaded.
Duplicate Similar Images
Load a photo folder and identical images and near-identical photos are grouped, with one image per group recommended to keep and the reason shown. Nothing is uploaded, and your original files are never deleted or changed.
Video & Audio1
Files & Storage11
Archive Studio — ZIP, TAR & tar.gz Viewer, Extractor & Creator
Drop a ZIP, TAR, tar.gz or gz to list what is inside — including ZIPs made on Japanese Windows whose file names are normally garbled. Extract safely, re-create a ZIP with UTF-8 names, or build a ZIP / tar.gz from folders. Everything runs on your device.
Batch Rename
Combine rules to rename files in bulk. Check old → new names live, catch duplicates and invalid names, then save renamed copies as a ZIP or into a folder. Files are never uploaded.
Duplicate Files
Load a whole folder and see groups of files whose content is byte-for-byte identical, with the space they waste. Nothing is uploaded and nothing is deleted: save the keep/duplicate verdicts as CSV or JSON and clean up with your own file manager.
File Hash — Checksum Calculator & Verifier
Drop a file to get its SHA-256 (and more); paste the published hash to see match or mismatch instantly. Even multi-gigabyte ISOs are read in chunks on your own device — nothing is uploaded.
Universal File Inspector
Drop any file to see its real format (from the content), its structure and metadata, what to watch out for, and which tools can process it — before opening it, or before sending it to someone.
Archive Filename Fix — ZIP Mojibake & Mac Clutter Repair
Drop garbled ZIPs and the clutter a Mac mixed in, and get them repaired in one go. See the names before and after side by side; compressed data is copied without recompression into a UTF-8 ZIP. Several ZIPs at once, all on your device.
Disk Usage Analyzer
Load a folder and see where the space goes as a treemap. Click a rectangle to drill down, then export tables by extension, kind, largest files, old files and duplicate candidates to Excel or CSV. Neither file names nor contents leave your device.
Extract Anything
Open a file and get its text, images, tables, URLs / e-mail / phone numbers, QR codes and barcodes, attachments and metadata, each with a count and the place it came from (file, page, sheet). What could not be extracted is explained. OCR is not supported.
File Manifest
Load a folder and export a list of relative paths, sizes, modified times and types to Excel or CSV. Neither file names nor contents are uploaded. Use it for delivery lists, inventories, audits and backup records.
File Split & Join
Cut a file to a size you choose (around 18 MB suits a 25 MB mail limit), save it as name.ext.001, .002 … and put it back together on the same page. Multi-GB files are read in small pieces on your device, so memory stays flat. Missing or mixed-in parts are reported before joining, and a SHA-256 record confirms the result.
Metadata Studio
A workbench for looking at, fixing and comparing the author, company, capture time and location stored in photos, PDFs and Office files. Every edit is re-read and verified, with a before/after diff. To just strip everything, use the dedicated remover tools.
Text & Conversion9
Date & Time Studio — Unix Timestamp & Time Zone Converter
Paste a Unix timestamp or almost any date string — the unit and format are detected automatically and shown in 15 formats and multiple time zones. DST gaps, month ends and Japanese era boundaries are handled precisely.
Encode / Decode Studio — Base64, URL, JWT & more
Paste %E3%81%82, an eyJ… token or any encoded string — the format is detected and decoded instantly. Errors say exactly which character is wrong and why, and nothing leaves your browser.
Markdown Studio — Live Editor & Preview
A split-view Markdown editor with instant GFM preview, a table formatter that aligns pipes, an automatic table of contents and HTML export. Output is always sanitized and external images load only when you allow them.
Text Studio — Character Counter & Text Cleaner
Paste text to see characters, words, lines and bytes instantly, then clean it up in one click — change case, remove duplicate or blank lines, sort naturally, convert line breaks. Every action reports what changed and can be undone.
Unicode Inspector — Character & Invisible Text Analyzer
Paste text to break it into characters with U+ codes, byte sequences and categories. Hidden zero-width spaces, BOMs, bidi controls and look-alike letters are detected and can be removed in one click.
IT Calculator (Storage, Transfer, Uptime, RAID)
Convert storage units (SI GB vs IEC GiB), estimate transfer time from file size and line speed, turn an uptime percentage into allowed downtime, and size RAID arrays, all with the formula shown. Type values with units, like “1.5GB” or “100Mbps”.
MIME & Content-Type Studio
Search extensions and MIME types both ways, get problems in a Content-Type header pointed out, and compare a dropped file’s extension, browser file.type and real content. Server config drafts are generated too.
QR Code & Barcode Reader
Drop an image or point your camera to read QR codes and barcodes. URLs are never opened automatically — you see the real destination domain and phishing warnings first. Everything runs on your device.
QR & Barcode Studio
Build QR codes from templates for Wi-Fi, contacts, events and more, and barcodes such as EAN or Code 128 with automatic check digits. Export PNG or SVG, or batch-create one code per line.
Web & SEO4
HTML Inspector
Paste a page’s HTML to review SEO and accessibility basics at a glance: heading structure, meta tags, Open Graph, image alt text, links and structured data — with a preview of how it may look in search and on social media.
robots.txt Tester
Paste a robots.txt to see instantly whether a URL is allowed or blocked for Googlebot or AI crawlers, and which line decided it. Misspellings and directives Google ignores are flagged too.
XML Sitemap Generator & Validator
Paste a list of URLs to create a correctly written sitemap.xml, or paste an existing sitemap to find the errors that stop Google from reading it — with line numbers.
Structured Data / JSON-LD Studio
Build JSON-LD for 13 common types with forms that separate required from recommended fields, then copy it. Paste JSON-LD or HTML to extract every script, @graph and array and see problems from the exact line of a syntax error to missing Google rich result requirements. It is not Google’s official tool.
Development & APIs7
Diff Tool — Text & Code Compare
Paste or drop two versions and see added and removed lines, plus the exact words that changed inside each line. Copy or save the result as a unified patch. Nothing leaves your browser.
UUID / ULID / NanoID / Token Generator
A UUID is ready the moment the page opens. Switch to UUID v7, ULID, NanoID or a random token, generate up to 10,000 at once and save them as .txt, .csv or .json. Paste an existing UUID or ULID to read its embedded time and version.
JSON Studio — Formatter & Validator
Paste JSON to format, minify or validate it instantly. Errors are shown with the exact line, column and cause, and comments or trailing commas can be auto-repaired. Your data never leaves your device.
Regex Tester
Type a pattern and matches light up in the test string instantly. Capture groups, replacement output and what each part of the pattern means are all on one screen — and patterns that would freeze your browser are stopped after one second.
Code Formatter — Format & Minify
Paste code to format it with the language auto-detected. Choose indent, line width, semicolons, quotes and trailing commas; JavaScript, CSS and HTML can also be minified with before/after size and reduction. Your code never leaves the browser.
XML Studio — Formatter & Validator
Paste XML to format, minify or validate it. Errors show the exact line, column and cause, and whitespace that carries meaning (mixed content, xml:space) is never touched. XPath search and JSON conversion are on the same screen. Your data never leaves your device.
YAML / TOML Studio — Validate, Format & Convert
Paste YAML, TOML or JSON to validate, format or convert it. Errors show the exact line and column, and type traps such as “no becomes false” and anything lost in conversion are flagged up front. Your data never leaves your device.
Networks & Domains1
Security & Privacy4
Crypto Studio — Hash, HMAC, Encryption & Keys
Type text and see 12 hashes — SHA-256, SHA-3, BLAKE3 and more — at once. Verify webhook HMAC signatures, encrypt text with a password, generate key pairs and create or check bcrypt hashes, all on your own device with nothing uploaded.
Password Studio — Generator & Strength Checker
A strong 20-character password is ready when the page opens. Fine-tune symbols and excluded characters, switch to a memorable passphrase, or check a password you already use — all without sending anything off your device.
Secret Scanner
Paste text or drop config and code files to list likely secrets with file, line and rule before you publish or share them. Values are masked by default and you can save a copy with them replaced by ***. A helper only — it cannot guarantee that nothing is missed.
Share Safe
Before you hand a file over, see what is hiding in it — listed per file with severity — and get a safe copy with everything removable removed. The copy is re-checked afterwards, and whatever is left comes with manual steps. Files are never uploaded.
Devices & Browsers6
Browser Inspector
A clear list of everything your browser shows to websites without asking — browser, OS, screen, language, GPU — plus support for 60+ features such as WebGPU and video codecs. Results are shown on the spot and never sent anywhere.
Keyboard Test
Each key lights up on the on-screen keyboard as you press it, so dead keys stand out immediately. Supports US and Japanese JIS layouts with numpad, and measures maximum simultaneous keys and chatter (one press registering twice).
Microphone Test
Start the mic to see input level (dBFS), waveform and spectrum. Clipping, noise and mute are detected automatically, and a guided speak test rates whether your mic is good enough for meetings. Nothing is uploaded.
Mouse & Wheel Test
Test all five mouse buttons and the wheel, and automatically catch “chatter” — single clicks registering as double clicks. Double-click interval, wheel counts, polling rate (Hz) and drag breaks are measured in numbers.
Webcam Test
Check your camera, its real resolution and frame rate in one click. If it doesn’t work, you’ll see the cause — permission, another app using it, not connected — and how to fix it. Nothing is recorded or uploaded.
Speaker Test
Press a button to play the left, center or right channel, a 20 Hz to 20 kHz sweep, or in-phase and out-of-phase noise. Every sound is generated in your browser, and the default volume is a quiet −24 dBFS.