Tools

Focused tools. Ready now.

Practical tools for everyday tasks.

Work with documents and images, compare text and time zones, clean data, create colors, or practice music and mathematics. Free, with no account or installation.

Choose a tool How local processing works

When a tool uses files, they stay on this device and are never uploaded.

Focused workflowsEach tool stays centered on one job
Local file processingYour files stay on your device
No accountOpen a tool and start
Free to useNo trial or paywall

Available now

Choose what you need

PDF Tools

Merge PDF

Combine several PDF files into one document, arrange their order and download the finished copy.

  • Multiple PDF files
  • Reorder before merging
  • One combined download
Merge PDFs Your files are combined locally and never uploaded.

Split PDF

Separate one PDF into individual pages or custom page groups, with every result ready to download.

  • One file per page
  • Custom page groups
  • Individual files or ZIP
Split a PDF The PDF is split locally and never uploaded.

Reorder PDF

See every page, move it by drag, touch or keyboard controls, then download the PDF in its new order.

  • Real page previews
  • Mouse, touch and keyboard
  • One reordered download
Reorder a PDF Your PDF stays on this device while you arrange it.

Protect PDF

Add an opening password to a PDF and download a strongly encrypted copy while keeping the original.

  • Opening password
  • Strong encryption
  • Original preserved
Protect a PDF The file and password stay in this browser tab and are never uploaded.

Unlock PDF

Unlock one or more PDFs with known passwords or ordinary printing, copying and editing restrictions, then download individual copies or a ZIP.

  • Multiple PDF files
  • Separate passwords
  • Batch ZIP download
Unlock PDFs The PDFs and their passwords are processed locally in your browser and are never uploaded.

PDF Scanner

Photograph pages or choose images, arrange and rotate them, then control the PDF page size and quality before downloading.

  • Camera or image files
  • Reorder and rotate pages
  • Page size and quality
Create a PDF The PDF is assembled in your browser. Your source images stay on this device.

Create lined paper

Make printable pages with the spacing, margins and line style you need. Preview every change, then download your PDF.

  • Precise spacing
  • Double-sided layouts
Create lined paper Created on your device

Image Tools

Redact image

Draw solid covers or destructive pixelation over sensitive details, then download a flattened copy with metadata removed.

  • Solid covers or pixelation
  • Undo and redo
  • Flattened PNG or JPG
Redact an image Covered pixels are replaced permanently; no original pixels or edit layers remain underneath.

Optimize images

Compress, resize and convert images together, then compare and download every result.

  • JPG, PNG, WebP, HEIC and HEIF
  • Before-and-after sizes
  • Individual files or ZIP
Optimize images Your images are processed locally and never uploaded.

Favicon and app icon generator

Turn one image into browser favicons, an Apple touch icon, installable app icons, a web manifest and ready-to-copy integration code.

  • ICO and PNG favicons
  • Apple and maskable icons
  • Manifest and HTML snippet
Create icon package Your source image is processed on this device and is never uploaded.

Create picture collages

Arrange local JPEG, PNG and WebP images into a grid or hero collage, adjust each crop, and download one image.

  • Grid or hero layouts
  • Per-image crop focus
  • Exact PNG or JPEG output
Create a picture collage Images stay in your browser and are not uploaded.

Print image contact sheets

Arrange local JPG, PNG and WebP images into captioned A4 or Letter contact sheets, then print or download a PDF.

  • Multi-page grids
  • Editable wrapped captions
  • Print and PDF export
Create contact sheets Free · Private · No account

Create QR codes

Turn text or web addresses into downloadable, static QR codes. Everything runs in your browser.

  • Private, on-device generation. Nothing is uploaded.
  • Static codes do not expire; linked websites can change or disappear. Always test your code with a scanner.
Make a QR code Static codes do not expire; linked websites can change or disappear. Always test your code with a scanner.

Color Tools

Generate color palette

Generate varied three-to-eight-color palettes, lock and reorder favorites, edit HEX or RGB values, and export reusable results.

  • Auto or color theory
  • Lock, edit and reorder
  • Copy, CSS and PNG export
Generate a palette Generation happens locally. Press Enter to explore again while keeping locked colors.

Check color contrast

Test a color pair against WCAG and repair a failing color.

  • AA and AAA results
  • Accessible color repair
  • Live text preview
Check contrast Free · Private · No account

Convert colors and check gamut

Convert one color across five formats and see whether it fits sRGB or Display-P3.

  • Five color formats
  • Visual color selector
  • Gamut-aware output
Convert a color Free · Private · No account

Create CSS gradients

Build linear and radial CSS gradients with exact color stops, opacity and positioning.

  • Linear and radial gradients
  • Exact hard stops and opacity
  • Copy CSS or download files
Create a CSS gradient Free · Private · No account

Subtitles

Convert subtitles

Convert SRT and WebVTT subtitles, or export a plain-text transcript. Review the result and download a separate copy.

  • SRT ↔ WebVTT
  • Plain-text transcript
  • Conversion preview
Convert subtitles Files stay on your device

Adjust subtitle timing

Move subtitles earlier or later, or correct progressive drift using two reference points. Preview the adjusted times before downloading.

  • Earlier or later
  • Two-point drift correction
  • Timing preview
Adjust subtitle timing Files stay on your device

Check and repair subtitles

Check subtitle structure, timing and readability. Choose repairs for numbering, empty entries, duplicates and ordering, then review a separate result.

  • Structure and timing checks
  • Readability warnings
  • Repairs you choose
Check and repair subtitles Files stay on your device

Convert VobSub to SRT

Turn DVD subtitle images into editable English text. Review the captions and download an SRT file.

  • English recognition
  • Review and edit
  • SRT download
Convert VobSub to SRT Files stay on your device

Text & data

Compare texts

Compare two texts with readable line and word changes, original line numbers, and optional case or whitespace normalization.

  • Side-by-side and unified change views
  • Case and whitespace comparison options
  • Plain-text comparison reports
Compare texts Your text and files stay in this browser.

Clean and convert CSV

Review delimited text, remove only the rows you choose, and export spreadsheet-safe CSV or TSV.

  • Delimiter detection
  • Explicit cleaning preview
  • Spreadsheet-safe export
Clean CSV Free · Private · No account

Time & date

Compare time zones

Compare one exact instant across selected time zones, including daylight-saving changes and date rollover.

  • Exact UTC instant
  • Date-aware offsets
  • Copy or download results
Compare time zones Free · Private · No account

Geography

World map

A colorful atlas of countries, states and provinces, capitals, and significant cities. Zoom in to discover more.

  • Colorful countries
  • States and provinces
  • Local place search
Explore the map Search stays on your device

Security

Split and recover a secret

Divide a secret into pieces. Choose how many are needed to put it back together.

  • Split a secret
  • Recover a secret
  • Copy or download each piece
Split and recover a secret Your secret and pieces stay on this device.

Music Tools

Practice piano

Connect a USB MIDI piano or keyboard, follow falling notes without a timer, import songs and record your playing.

  • USB MIDI or onscreen keyboard
  • Wait-mode lessons and MIDI import
  • Local recording and audio export
Practice piano Runs locally in current desktop Chrome. USB MIDI support depends on the device and operating-system driver.

Mathematics Tools

Practice mathematics

Work through arithmetic, one-variable equations or two-variable systems one exercise at a time.

  • Four predictable difficulties
  • Immediate answer feedback
  • Printable worksheet and answer key
Practice mathematics Exercises, answers and printable PDFs are created locally. No account or learner history.

Convert LaTeX to SVG, PNG, JPG or PDF

Turn a LaTeX equation into an image, ready to download or copy.

  • SVG · PNG · JPG · PDF
  • Scaling
  • Copy image
Convert LaTeX to SVG, PNG, JPG or PDF Your equations stay on this device.

Privacy by design

How local processing works

  1. 1
    Your browser does the work

    Each tool runs directly in your browser, with no account, app download or setup.

  2. 2
    Files stay on your device

    When a tool uses files, it reads only the ones you choose and does not upload them.

  3. 3
    You choose what to save

    Results stay in the current session until you copy or download them.