Higher tolerance ignores tiny changes between frames. 0 keeps every change.
1 MB = 1,000,000 bytes. Leave blank for no target. This is a maximum, not an exact padded size. Fitting may reduce dimensions and fine detail; your quality settings and frame timing stay as chosen. Use separately from Fit to X.
Target limits
Enter 0.000001 to 100 MB (up to 6 decimal places). Fitting stops after 8 attempts or at 120 px wide (or the original width if smaller). Locked dimensions allow one attempt. If the target cannot be met, you will see an error and the smallest size tested. Cancel is available during export.