# Does Syncthing support incremental syncing? Syncing only the modified parts of files?

**URL:** https://forum.syncthing.net/t/does-syncthing-support-incremental-syncing-syncing-only-the-modified-parts-of-files/20466
**Category:** General
**Created:** [July 1, 2023, 2:10pm UTC](https://forum.syncthing.net/t/does-syncthing-support-incremental-syncing-syncing-only-the-modified-parts-of-files/20466 "2023-07-01T14:10:01Z")
**Posts on this page:** 2
**Page:** 1

<div class="post-metadata">

### Author: ![lbsjsjob](https://forum.syncthing.net/user_avatar/forum.syncthing.net/lbsjsjob/32/14544_2.png) [@lbsjsjob](https://forum.syncthing.net/u/lbsjsjob)
#### Post date: [July 1, 2023, 2:10pm UTC](https://forum.syncthing.net/t/does-syncthing-support-incremental-syncing-syncing-only-the-modified-parts-of-files/20466/1 "2023-07-01T14:10:01Z")

</div>

Does Syncthing support incremental syncing? Syncing only the modified parts of files?

For example, if I have a PDF file and I annotate it, then save it, does Syncthing support syncing only the modified parts of the file, which can greatly reduce sync time? How can I configure this?

---

<div class="post-metadata">

### Author: ![calmh](https://forum.syncthing.net/user_avatar/forum.syncthing.net/calmh/32/15311_2.png) [@calmh](https://forum.syncthing.net/u/calmh)
#### Post date: [July 1, 2023, 2:14pm UTC](https://forum.syncthing.net/t/does-syncthing-support-incremental-syncing-syncing-only-the-modified-parts-of-files/20466/2 "2023-07-01T14:14:25Z")

</div>

Syncthing does this always, subject to the block size (minimum 128 KiB).