File Preflight
Select a file, enter the measurable requirements supplied by the destination where you will upload it, and File Preflight inspects the file locally and compares it against what you entered. It separates what matches from what needs a fix, and recommends the right ImageToSend tool when a measurable requirement does not match.
Check a file against your requirements
Drop a file here or click to select
Images (JPG, PNG, WebP, HEIC/HEIF) and other files — inspected locally
Select a file first.
File Preflight inspects objective, measurable properties of your file locally in your browser and compares them against the requirements you enter. It reports each requirement as Matches, Needs a fix, or Check manually.
It is a diagnostic tool. It does not change your file. When a measurable requirement does not match, it points you to the ImageToSend tool that can help.
Local processing
Your file is inspected in your browser and is not intentionally uploaded to ImageToSend servers.
What File Preflight checks
- •File size against a maximum you enter (decimal bytes, KB, MB).
- •Format against the accepted format(s) you choose.
- •Width and height in pixels against minimum and maximum values you enter.
- •Orientation (portrait, landscape, or square) against a required orientation.
- •Aspect ratio against a required ratio you enter (e.g. 3:4 or 35:45).
What File Preflight cannot check
- •Whether a third-party destination will accept the file.
- •Government, legal, or authority acceptance.
- •Document authenticity or identity verification.
- •Facial/photo compliance and subject positioning rules not encoded by your entries.
- •Visual content acceptance or malware/security certification.
Three result states
Your file meets the measurable requirement you entered. This is a comparison against your entry, not a guarantee of acceptance.
Your file does not meet a measurable requirement. File Preflight recommends the ImageToSend tool that can help, when one exists.
ImageToSend cannot responsibly determine this. Confirm it against the destination's current instructions before submitting.
When to use each fix tool
File size too large
Use the Smart Image Resizer to reduce file weight toward the maximum you entered.
Format not accepted
Use the Image Converter to switch to an accepted format.
Orientation, crop, or aspect-ratio issue
Use the Document Editor to rotate, crop, or lock an aspect ratio.
Several images, one PDF needed
Use Images to PDF to combine multiple images into a single PDF.
File Preflight does not carry your file between tools. Open the recommended tool, select your file again there, apply the fix, and download the result.
Known limitations
- •File Preflight reads properties only — it does not modify your file.
- •Pixel dimensions, orientation, and aspect ratio are available only for images your browser can display. For non-image files, those properties are reported as “could not be checked.”
- •HEIC/HEIF input is decoded locally to read dimensions and is subject to a 6 MiB (6,291,456 bytes) per-file limit and a 20-second decode timeout. If decoding fails, file size and format are still reported; dimensions are not.
- •File size uses decimal units: 1 KB = 1,000 bytes and 1 MB = 1,000,000 bytes.
- •Aspect-ratio matching allows for normal integer-pixel rounding. A match means the image’s pixel dimensions are consistent with the ratio you entered within approximately one pixel.
- •ImageToSend cannot enlarge an image. If a minimum width or height is not met, no ImageToSend tool can increase the resolution — use a higher-resolution source photo.
- •“Matches” means your file matches the measurable requirements you entered. It does not mean a third-party destination will accept the file. Always confirm the destination's current instructions before submitting.