SizeFitFile size limits for email and chat apps
Why “SizeFit aims for” is smaller for email: attachments are Base64-encoded, which adds about a third, and message headers count toward the limit. A 25 MB Gmail limit therefore fits a file of about 18 MB. Chat apps and upload forms count the file itself.
| Platform | Limit | SizeFit aims for | Notes | Checked | Source |
|---|---|---|---|---|---|
| Gmail | 25 MB | 18 MB | Gmail's 25 MB limit counts the attachment after email (Base64) encoding, so the real file must be about 18 MB. | 2026-10-20 | Source |
| Outlook | 20 MB | 14.4 MB | Outlook.com and Microsoft 365 default to 20 MB per message including encoding overhead. | 2026-10-20 | Source |
| Yahoo Mail | 25 MB | 18 MB | 25 MB per message including encoding overhead. | — | Source |
| iCloud Mail | 20 MB | 14.4 MB | Messages up to 20 MB; larger attachments switch to Mail Drop links. | — | Source |
Chat apps
| Platform | Limit | SizeFit aims for | Notes | Checked | Source |
|---|---|---|---|---|---|
| Discord | 20 MB | 20 MB | Free accounts: 20 MB per file since August 2026 (was 10 MB from 2024). | 2026-10-21 | Source |
| Discord Nitro Basic | 50 MB | 50 MB | Nitro Basic and Level 2 boosted servers: 50 MB per file. | 2026-10-21 | Source |
| Discord Nitro | 500 MB | 500 MB | Full Nitro: 500 MB per file. | 2026-10-21 | Source |
| WhatsApp (inline video) | 16 MB | 16 MB | 16 MB plays inline everywhere, including older apps and the Business API. Newer apps may allow 64–100 MB depending on connection. | — | Source |
| Facebook Messenger | 25 MB | 25 MB | 25 MB per attachment. | — | Source |
| Signal | 100 MB | 100 MB | 100 MB per attachment. | — | Source |
Upload forms
| Platform | Limit | SizeFit aims for | Notes | Checked | Source |
|---|---|---|---|---|---|
| Upload form · 10 MB | 10 MB | 10 MB | Common limit for job applications, school portals and support forms. | — | — |
| Upload form · 50 MB | 50 MB | 50 MB | Common limit for assignment and submission portals. | — | — |
| Upload form · 100 MB | 100 MB | 100 MB | Common limit for LMS and cloud forms. | — | — |
Limits change — Discord alone went from 8 MB to 25 MB, to 10 MB and to 20 MB over a few years. If you spot an outdated number, tell us. Machine-readable version: presets.json.
Make any video fit one of these limits
Pick the platform in SizeFit and it compresses to the right number — then checks the file still plays to the end and still has its audio.