TEXT TOOLS
Free Case Converter online
Convert text between uppercase, lowercase and more.
Case Converter is a free browser tool that lets you convert text between uppercase, lowercase and more. Drop your file into Case Converter, choose your settings, and save the finished file. Case Converter works on your device only, so no file or text is ever uploaded.
- Free to use
- No signup
- No uploads
- Works offline
Why use Case Converter
- convert text between uppercase, lowercase and more without installing software
- Your file is processed on your device by Case Converter, never uploaded
- Case Converter needs no account, email address or payment details
- Case Converter is batch-friendly: reuse it immediately on the next file
- Case Converter is keyboard accessible and screen-reader friendly
- Case Converter is free forever, with no watermark on the result
Case Converter runs entirely inside your browser. Your file is never uploaded, stored or shared, and nothing is retained once you close the tab.
How to use Case Converter
- Add your file Drag your file onto the drop zone or pick it from your device.
- Confirm the output Check that the output settings match what you need.
- Run the tool Case Converter works instantly on your device, with no queue and no upload wait.
- Download the result Save the finished file straight to your device, then reuse the tool as often as you like.
Benefits
Private by design
Your file stays on your device while Case Converter works. Case Converter never sends it to a server, so confidential work stays confidential.
Instant results
Case Converter finishes most jobs in under a second because the work happens on your own hardware.
No signup, no limits
Use Case Converter as many times as you want. Case Converter asks for no account, adds no watermark and keeps no paid tier gating the output.
Works offline
Once the page has loaded, Case Converter keeps working without a connection, which helps on flights and locked-down networks.
Who it is for
For marketers
Marketers use Case Converter to publish campaign assets without installing software: convert text between uppercase, lowercase and more on a shared or locked-down machine.
For students
Case Converter helps students hand in coursework quickly, since your file never leaves the laptop it was created on.
For freelancers
Case Converter helps freelancers send client deliverables quickly, since your file never leaves the laptop it was created on.
How it works
Case Converter loads your file into memory, applies the change you requested to the underlying data rather than to a screenshot of it, and writes a fresh copy for download. Your original stays untouched on disk, and every step of Case Converter happens inside your browser sandbox.
Frequently asked questions
Is Case Converter free to use?
Yes. Case Converter is completely free with no account, no trial and no usage cap. Every feature on this page is available on the first visit.
Does Case Converter upload your file to a server?
No. Case Converter processes your file inside your browser, so it never reaches a DocTools server. That also means the tool keeps working if your connection drops mid-task.
Is there a file size limit?
The practical ceiling is your device's available memory rather than a server quota. Files up to roughly 100 MB work comfortably on a typical laptop in Case Converter.
Do I need to install anything to use Case Converter?
No installation is needed. Case Converter runs in Chrome, Edge, Firefox and Safari, on desktop and on mobile, with no extension or plugin.
Can I use Case Converter on a phone or tablet?
Yes. The Case Converter interface adapts to small screens and supports touch input, though very large jobs are faster on a desktop browser.
What happens to your file when I close the tab?
It is discarded. Case Converter keeps everything in temporary browser memory, so closing the tab removes every trace of the session.
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Last updated: 2026-09-07