OfficeBaoMainland China edition

Everyday office tools

PDF, images, video, tables and text — every small job in one place, processed in your browser.

Files are processed in your browser — nothing is uploaded Education tools Need an account? Request access

38 tools

Text tools

Count, clean and convert text without leaving the tab.

Text statistics

Characters, words, Chinese characters, lines and reading time — counted instantly.

In-browser

Clean up text

Trim lines, drop blank lines, collapse spaces, remove HTML and duplicate rows.

In-browser

Change letter case

UPPER, lower, Title Case or Sentence case — plus full-width punctuation fixes.

In-browser

JSON formatter

Pretty-print, minify and validate JSON with the exact error position.

In-browser

Image tools

Compress, convert and resize pictures in bulk.

Compress images

Batch-shrink photos for chat or slides, with an optional max width.

In-browser

Convert images

Turn PNG, JPEG and WebP into each other in one drop.

In-browser

Resize images

Scale to a fixed width or height and keep the aspect ratio.

In-browser

Watermark photos

Stamp a class name or school mark across many photos at once.

In-browser

Document tools

Merge, split and rearrange PDFs on your own device.

Merge PDFs

Combine several PDFs into one file, in the order you choose.

In-browser

Split PDF

Extract a page range or save every page as its own PDF.

In-browser

Rotate & delete pages

Fix sideways scans and drop pages you no longer need.

In-browser

Images to PDF

Turn photos or scanned pages into a single PDF handout.

In-browser

Tables & grades

Analyse a class list or merge several sheets without Excel formulas.

Merge sheets

Combine several class lists and flag duplicate students in one click.

In-browser

Office tools

Pull text out of PDFs, sign documents and compare drafts.

Extract PDF text

Copy text out of a text-based PDF and export it as TXT or Markdown.

In-browser

Sign a PDF

Draw a signature on screen and place it on any page of a PDF.

In-browser

Compare text

Highlight added and removed lines between two versions of a draft.

In-browser

QR codes

Turn a link into a printable QR code, or read one from a photo.

In-browser

Audio tools

Pull clean audio out of a video.

Extract audio

Pull the audio track out of a video as M4A, WAV or MP3.

In-browser

Video tools

Rotate, mute, compress and mask clips — nothing is uploaded.

Video rotate

Fix sideways clips by rewriting the rotation flag — lossless and instant.

In-browser

Remove audio

Strip the soundtrack out of a clip without touching the picture.

In-browser

Compress video

Shrink a clip to an email-friendly size, encoded locally.

In-browser

Video mosaic

Mask a face, plate or watermark before a clip goes into a slide.

In-browser

Lesson prep & more

Other tools for the classroom.

More tools on the way · Coming soon

Tell us which job eats your evenings and it may end up here.

LaTeX formula editor

Live math formula preview, with templates and copy as LaTeX or MathML.

In-browser