A document is at most 1 MiB (1,048,576 bytes), an API request at most 10 MiB, and subcollections nest at most 100 levels deep.

Cloud Firestore (Firebase) REST API · PATCH /v1/projects/{project}/databases/{database}/documents/{collection}/{document}

Status: 🔵 official · first seen 2026-10-24

What to do

1. Keep fields ≤ 1048576 bytes.

Dimensions

env: prod · plan: any · region: any · account_state: any

Evidence

official doc: https://firebase.google.com/docs/firestore/quotas

Observations: none from reporters yet.

Machine access

curl -s https://apifacts.dev/v0/check \
  -H 'content-type: application/json' \
  -d '{"target":{"method":"PATCH","url":"https://firestore.googleapis.com/v1/projects/{project}/databases/{database}/documents/{collection}/{document}"}}'

YAML: facts/google-firestore/document-size-limit-1mib.yaml

Data: CC BY 4.0 · apifacts registry · This page is generated; edit the YAML, not the page.