CSV to XLSX converter
Convert CSV files to XLSX online — free, no signup, no email, no watermark. Files are auto-deleted after 24 hours. 3 conversions a day on the free tier, plus a free API key (same quota) and an HTTP API for bulk and automated jobs.
- No watermark
- No email required
- Files deleted in 24h
- EU-hosted over HTTPS
How to convert CSV to XLSX in 3 steps
- 01
Drop your file
Drag your CSV file into the upload zone above, or click to pick it. The first 3 conversions per day are free with no signup.
- 02
Pick XLSX as the target
XLSX is selected automatically when you drop a CSV, but you can change it to any of the supported targets in the dropdown.
- 03
Click Convert
Most CSV → XLSX conversions finish in under 10 seconds. The download URL is signed and valid for 24 hours, then the file is deleted.
Why bulkconvert vs. Smallpdf, ILovePDF, Convertio
The big incumbents lock the easy stuff (no watermark, no signup) behind their paid tier and process files in regions you may not want. We don't.
| bulkconvert | Smallpdf | ILovePDF | Convertio | |
|---|---|---|---|---|
| Free conversions per day | 3 (no signup) | 2 (then login) | 2 (then login) | 10 minutes/day (then login) |
| Signup required | No | Yes (after 2nd) | Yes (after 2nd) | Yes (after limit) |
| Watermark | Never | Free tier: yes | Free tier: yes | Free tier: yes |
| Files deleted | 24 h | 1 h (paid) / unclear (free) | 2 h | 24 h |
| Data residency | EU | Mixed | Mixed | US |
| Public HTTP API | Yes (Bearer token) | Paid only | Paid only | Paid only |
Pricing and policies last reviewed early 2026. Each competitor's site is the source of truth — if you spot drift, email hello@bulkconvert.io.
Frequently asked questions
- Upload your CSV above, XLSX is auto-selected as the target, click Convert. The first 3 CSV to XLSX conversions per day are free with no account. The download URL is valid for 24 hours, then the file is deleted from our servers.
- Yes. The free tier covers 3 conversions per day with no signup, no email, no watermark — and that same free quota works against the HTTP API too, so you can grab a free API key without paying. Pro (€9/mo) lifts the daily quota to 100. Bulk (€19/mo) is unlimited through the UI. The API plan (€49/mo) ships 10,000 conversions/month via the HTTP endpoint plus 5 GB max file size.
- No. The free tier works without signup or email. If you want to paste an access key for higher limits, you can sign in with a magic link — still no password required.
- Conversion happens on EU-hosted infrastructure over HTTPS. Source files are kept only as long as the conversion job needs (seconds). The output is held for 24 hours via a signed URL, then permanently deleted. We never read file contents or share data with third parties.
- XLSX can losslessly represent the contents of a CSV file in most cases. We preserve the original quality unless you explicitly request a downsample.
- Free: 10 MB. Pro: 100 MB. Bulk: 1 GB. API: 5 GB. Files larger than the tier limit get a 413 response with the exact file size and the smallest tier that would accept it.
- Yes. POST to https://bulkconvert.io/api/v1/convert with a Bearer token, a source_url (publicly fetchable), and to:"xlsx". The response includes the signed download URL inline plus your monthly usage. Every signed-in user gets a free key with the same 3/day quota as the web UI; upgrade to the API plan when you need more. See /docs/api for the full reference.
- No watermark, ever. Even on the free tier the output is a clean XLSX file identical to what the paid tiers produce.
- CSV → XLSX is the standard move when you need to repurpose the content as XLSX. Common cases: students sharing assignments, freelancers turning CSV reports into client-editable formats, and devs pulling text out of CSV for downstream processing.