Quick answer
Email attachments is the core object here; understand the problem it solves before choosing a tool or workflow. Mailboxes often limit 10-25MB; 1-3MB per image is safer. Resize before lowering quality.
Why it matters
Without the concept, format, permission or compatibility issues are easily misread as tool failures.
Recipient clients may compress again.
Step by step
- Back up the original; never overwrite the only copy.
- Confirm the target platform's format, dimensions and size limit.
- Cap the longest side first, then quality; change one variable at a time.
- Compare size and sharpness after compressing, and step back one setting if needed.
- Keep the original until the output is confirmed.
Common mistakes
- Chasing the smallest file and blurring text/edges.
- Converting transparent PNG to JPEG, turning transparency white or black.
- Recompressing the same file and accumulating loss.
- Overwriting the original, so a bad result cannot be undone.
Checklist
- Original backed up.
- Output format/dimensions/size meet the platform.
- Text is readable and transparency is correct.
- Verified in the real page/email/upload field.
- Original kept until confirmed.
Key facts
- Recipient clients may compress again.
- Compress each image before zipping several.
FAQ
What is Email attachments?
Email attachments is the core object here; understand the problem it solves before choosing a tool or workflow. Mailboxes often limit 10-25MB; 1-3MB per image is safer. Resize before lowering quality.
How long does it take?
Usually 1-3 minutes; for intermittent issues, run 30 seconds and retest elsewhere.
Is data uploaded?
Runs locally and does not upload video/audio; extensions may still read the page.
Source: Gmail attachment limits