Compress documents in your browser
Drop a PDF, Word, Excel, PowerPoint or ODT file. It stays in this tab, and we send you to the matching compressor.
or browse your device. Batches welcome, we detect the format
Pick a format, or drop a file and we will.
Each card is a live compressor. Same privacy model as the rest of the site: the file is processed in this tab and never sent anywhere.
Compress PDF
A PDF compressor that makes a PDF smaller without rasterising it. Scans and image-heavy documents shrink hardest, and pages, text and links are untouched.
Open the PDF toolCompress DOCX
nanofile is a free online DOCX compressor that runs entirely inside your own tab, with nothing uploaded. The weight of a Word document is almost always the images pasted into it: those get re-encoded and the archive rebuilt, while your words, styles and page layout are carried through untouched.
Open the DOCX toolCompress XLSX
nanofile is a free online XLSX compressor that runs entirely inside your own tab, with nothing uploaded. An oversized workbook is often a small grid carrying a folder full of pictures: we re-encode those pictures and rebuild the XLSX package, and cells, formulas, charts and sheet layout stay as they are.
Open the XLSX toolCompress PPTX
Slides are light; full-resolution photography is not. We re-encode JPEG and PNG pictures inside the deck and rebuild its package. Text, masters, notes, transitions and animation stay where they are.
Open the PPTX toolCompress ODT
OpenDocument files are ZIP packages, and the weight usually sits in Pictures. We re-encode those raster images and rebuild the package without laying out or rewriting your document.
Open the ODT toolHow to compress documents
Drop the documents
A single PDF or a mixed handful. We sniff the bytes, so a Word file named as a ZIP still lands on the Word tool.
Land on the matching compressor
PDFs keep their text selectable. Office files are rebuilt as the same format, with the pictures inside recompressed. Nothing is converted into a different document type.
Compare and save
Check the saving, pick a target size if you need one for email, then download. The original is still on your disk, untouched.
The home page routes any file we can compress, including code, fonts and ZIP archives.
Why documents get big, and what compressing one can do
Almost every oversized document is oversized for the same reason: the pictures inside it. Words are extraordinarily cheap to store, so the text of a fifty page report is a rounding error next to one photograph pasted in at full camera resolution. A Word file that has ballooned to 40MB is usually a handful of pages carrying a folder of untouched 12 megapixel images, and the same is true of decks, spreadsheets and scanned PDFs.
The Office formats make this literal. A .docx, .xlsx, .pptx or .odt is a ZIP archive with the text stored as XML and every image sitting beside it as an ordinary file. That is why compressing one is safe in a way that is not obvious: the tool re-encodes the images and rebuilds the same archive, so cells, formulas, styles, speaker notes, transitions and page layout all come through untouched. Nothing is converted into a different document type, and nothing is flattened into a picture.
PDF works differently but the arithmetic is identical. What it cannot do is invent savings that are not there. A text-only document has almost nothing to give up, and any tool promising to halve one is either rasterising your pages, which destroys selectable text and links, or lying. When there is little to gain here, the result panel says so rather than pretending.
Questions
How do I compress documents without uploading them?
Drop them here. The file is opened in your browser and sent to the PDF, Word, Excel, PowerPoint or ODT tool on this site. It is never posted to a server.
Which document formats can I compress?
PDF, DOCX, XLSX, PPTX and ODT. Image-heavy scans and decks shrink most. A text-only PDF has little fat to lose, and the tool will say so rather than pretend.
Will the text stay selectable?
Yes. Pages are not turned into pictures. PDFs keep their text, links and form fields. Office files keep their words and layout; only embedded images are recompressed.
Can I compress a document to a target size?
The PDF tool can search for the highest quality that fits under a figure you name, such as 1MB for email. The Office tools shrink the images inside and report what that saved.
What size does a document need to be to email it?
Gmail, Outlook and iCloud all stop somewhere between 20 and 25MB, and the limit applies to the encoded message, which is roughly a third larger than the file itself. Aim for 10MB and you clear every common provider with room to spare. On an image-heavy PDF or deck that is usually reachable with no visible difference on screen.
Which document type shrinks the most?
Whichever one is carrying the most photography. Scanned PDFs are the biggest winners, because a scanner embeds a full-resolution image of every page and almost none of that resolution is doing any work. Slide decks built from phone photos come next, then image-heavy Word files. A text-only document of any type is already close to as small as it gets.
Does compressing a document remove its metadata?
With the switch on, which is the default, yes. A PDF loses its author, producer, creation dates and the XMP packet, and any Content Credentials (C2PA) manifest attached to it goes too. Office documents lose their revision tracking identifiers and the properties saved alongside the content. Turn the switch off and everything stays exactly as it arrived.
Is this document compressor free?
Yes. The work runs on your device, so there is no account, no daily limit and no watermark.