Discord cuts the default upload limit for webhooks to 10 MiB
What changed
On December 16, 2024 Discord announced that on January 16, 2025 the default file upload limit would change from 25 MiB to 10 MiB for webhooks and interaction responses. The changelog says the 10 MiB limit was already active for users and bot users. On September 3, 2026 Discord raised the default to 20 MiB for users, bots, webhooks and interaction responses.
What it means
From January 16, 2025 a file posted through a Discord webhook or interaction response could be at most 10 MiB by default, down from 25 MiB.
Who is affected
Scheduling tools and integrations that post images, videos or files to Discord channels through webhooks.
What to do by 16 Jan 2025
Check file sizes before posting to a webhook and compress or link larger files. Discord raised the limit again to 20 MiB on September 3, 2026.
What this means for you
A webhook is a simple link that lets a tool post into a Discord channel. In January 2025 Discord made the biggest file you could send that way much smaller: from 25 MiB down to 10 MiB. Bigger files were refused. The limit went back up to 20 MiB in September 2026.
The details
- Announced: December 16, 2024. Effective: January 16, 2025.
- Change: default file upload limit from 25 MiB to 10 MiB for webhooks and interaction responses.
- Already in place: "this limit is already active for users and bot users", so bots posting as bot users were not newly affected.
- Superseded: on September 3, 2026 the default rose to 20 MiB for users, bots, webhooks and interaction responses (our entry).
- Higher limits: the uploading files reference says the limit may be higher depending on the server's Boost tier or the user's Nitro status.
What to do next
- Business owners: Nothing now; the limit is 20 MiB again.
- Marketers and agencies: Keep Discord uploads under the current default, or post a link to larger videos.
- Developers: Read the limit from documentation or
attachment_size_limitrather than hard-coding 25 MiB, and reject oversized files before calling the webhook.
Primary sources
- Discord Developer change log: Default File Upload Limit Change (December 16, 2024)
- Discord Developer docs: Uploading files
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