Convert files
without giving
up your privacy.
Every conversion runs entirely in your browser — PDFs, spreadsheets, data files, images. No uploads. No servers. Your files stay yours.
The converter that works for you,
not against you.
Most online converters upload your files to their servers. Here's why that matters — and why we're different.
Zero Data Exposure
Files are read by your browser and processed using WebAssembly libraries. They never leave your machine. Verify anytime with your browser's network inspector.
Instant Processing
No upload queues, no server processing delays. Your CPU does the work directly. Most conversions complete in under two seconds.
GDPR & HIPAA Friendly
Because files never leave your device, there are no data residency concerns. Ideal for sensitive business documents, PII, and confidential data.
27 converters, all free.
PDF Tools
Everything you'd use Acrobat for — without the subscription or upload.
All pdf tools →Spreadsheets
Excel ↔ CSV ↔ JSON, all directions. For accountants and analysts.
All spreadsheets →Cryptographically boring. That's the point.
Browser reads the file
When you drop a file, your browser's File API opens it directly. Nothing crosses the network. There is no "upload" — the bits are already where they need to be.
// in-browser
const buf = await
file.arrayBuffer()
// 0 bytes sentWASM does the work
pdf-lib, SheetJS, and js-yaml compile to WebAssembly modules that run sandboxed in your browser. Same libraries a server would use — just, on your device.
// sandboxed
const out = await
convert(buf,
'pdf', 'docx')You download
The result is saved to your disk via a Blob URL. We log metadata only on paid tiers, and only if you opt in. Your file data is never recorded.
// save locally
URL.createObjectURL(
out
)
// download startedOther converters
vs. HarborConvert.
A quick comparison with the category's best-known server-based tools.
Typical online converter
Upload-based. Server-processed.
HarborConvert
Browser-native. Server-free.
Free forever for single files. Pay when you scale.
Every tool works on the free tier. Upgrade for batch processing, larger files, team sharing, or API access.
Deckhand
For occasional conversions.
- All 27 converters
- Single file per conversion
- Up to 5MB per file
- No account required
Harbor Pro
For daily users and freelancers.
- Everything in Deckhand
- Batch up to 10 files
- 50MB per file
- Download history
- Ad-free experience
Harbor Business
For teams and automation.
- Everything in Pro
- Batch up to 100 files
- 200MB per file
- Team sharing (5 seats)
- REST API access
Ready to convert
without compromise?
Join privacy-conscious users and teams who trust HarborConvert with their most sensitive files.