Privacy-focused processing

Simple, private file tools

Convert images, GIFs, PDFs, audio and video with clear, easy-to-use tools designed with privacy in mind.

Explore tools

What you can do

Convert files, earn points, redeem rewards

CASTARA gives you simple browser tools for common file tasks. Guests can start with the tools, and signed-in users can earn points from daily activities and eligible tool use.

Use file toolsCompress, resize, convert, merge and split files.Earn daily pointsCheck in and play the mini game when signed in.Redeem rewardsUse your points for available member rewards.

Private by design

Our tools follow privacy-focused practices and clear safety standards.

Privacy-focused tools

Use file tools with clear privacy and safety controls.

Privacy by default

We use reasonable safeguards for files, account information and points records.

Every core tool works for guests

Use the tools without registering. An account adds convenience and rewards; it is not required for core conversion.

CASTARA

Why create a free account?

Keep using CASTARA as a guest, or register when these extras are useful.

Prefer not to register? All core conversion tools remain available.

Create a free account

Supported formats

Images: JPEG, PNG, WebP and GIF. Documents: PDF. Media: MP4, M4V, MOV and WebM.

Frequently asked questions

How are my files handled?

Files are used only to complete the action you request. Account and points information is handled separately under our Privacy Policy.

Will output always match the original?

No. Compression, conversion and PDF rewriting may alter metadata, forms, fonts or layout. Keep originals and inspect results.

What happens when I close the page?

Save downloaded results somewhere safe before closing the page. Selected files are cleared when you leave.