How to Convert and Edit Files with an Online File Converter

reaConverter's free online file converter lets you upload files, edit images (resize, rotate, crop) before conversion, pick an output format, and download the results individually or as a ZIP. It works in your browser with no install required, and supports batch processing. The main constraints to know upfront: some rare formats have a daily conversion limit on the online version, and if you hit that limit the site points you to the desktop version with a 15-day free trial.

What You Can Do Before Converting

The online tool combines conversion with basic image editing, so you can fix orientation, dimensions, and framing in the same session rather than editing in one app and converting in another.

Resize

• Set width and height in pixels or percent
• Choose an aspect-ratio mode: none, lock by width, lock by height, or lock both
• An advanced mode is available for finer control

Rotate

• Quick 90° right, 90° left, or 180° rotation
• Auto-rotate based on EXIF data
• Custom angle in degrees, with a background color option for the filled area
• An advanced mode is available

Crop

• Crop from the edges or from the center
• Auto-crop option
• Set top and bottom offsets in pixels
• Choose a background color for the cropped result

You can stack multiple editing actions in one session — the interface shows a running count of active edits — and they apply before the file is converted.

Step-by-Step: Convert and Edit a File

1. Add your files. Use the add control to select the files you want to process. The interface displays the number of files loaded and their sizes, so you can confirm everything uploaded correctly.
2. Apply edits (images only). Open the editing panel and add actions like Resize, Rotate, or Crop. Configure each action's settings, then confirm. The session tracks how many editing actions are active.
3. Choose the output format. Set a single target format for all files, or assign formats per file. The converter shows the format each file will be converted to.
4. Start the conversion. Trigger the convert action. During processing you'll see per-file status: uploading, converting to the target format, and then the result with the output format and file size.
5. Download the results. Grab files individually, or use the "all as ZIP" option to download everything in one archive. When multiple files are produced from one input, the ZIP shows the file count and total size.

Handling Common Failures

The tool surfaces specific error states rather than failing silently. The most important one to plan around:

Because rare formats are capped daily on the online version, if your workflow depends on an uncommon format, either convert in smaller batches across days or move to the desktop version for unlimited handling.

Practical Notes

• Batch first, edit second. Since edits apply per image, load your full batch, then work through the images that need adjustment. Files that don't need editing can go straight to format selection.
• Use ZIP for multi-file outputs. If a single input produces several output files, the ZIP download keeps them together and shows you the count and combined size before you download.
• EXIF auto-rotate saves a step. Phone photos often carry orientation data; the auto-rotate option corrects them without manual angle entry.
• Check the format list before uploading large batches. Confirming your target format is supported avoids re-uploading after a failure.

The online converter covers the common path — upload, edit, convert, download — without an account or install. The main reason to leave it is the rare-format daily cap, which the desktop trial is designed to solve.