What is a speed run timer?

A speed run timer is a stopwatch built for speedrunning: instead of one lap time it records a named split at each checkpoint, then compares every segment and the running total with your personal best. Gold splits mark segments you just ran faster than ever before.

Is this speedrun timer free to use online on PC?

Yes. It runs free in any modern desktop or mobile browser with no download or account. Timing, split names and saved personal bests stay in that browser's localStorage.

Is this a LiveSplit alternative? Can it open .lss files?

It covers the core LiveSplit workflow in a browser tab: named splits, Space to split, undo, skip, PB comparison, gold segments, Sum of Best and an attempt counter. Import .lss reads the split names, Personal Best split times, best segments and attempt count from a LiveSplit file (real time, or game time if no real time is stored), and Export .lss writes them back. Layouts, subsplit grouping, autosplitters and load-removed game time are not supported.

Sum of Best is the total of your best-ever time for every segment, so it is the fastest run you have already proven you can do piece by piece. Your PB minus your Sum of Best is the possible time save. Example: a 4:13.95 PB with a 4:05.10 Sum of Best leaves 8.85 seconds to gain.

What is Best Possible Time?

Best Possible Time is your current run time plus your best segment for every split still left. It updates while you run, so it tells you whether a PB is still possible after a slow segment.

What do the delta colors mean?

The delta is your running total minus your PB split at the same point. Green means ahead and red means behind. The brighter green means you gained time on that segment; the paler green means you are still ahead but lost time. The paler red means you are behind but gained time; the brighter red means you lost more. A gold delta marks a new best segment.

How do I add the speedrun timer to OBS?

Click Overlay mode (or open /tool/speedrun-timer?overlay=1&bg=green), add a Window Capture of that browser window in OBS and apply a Chroma Key filter. Hotkeys only work while the browser window is focused, because a web page cannot read global hotkeys. You can also use a Browser Source with ?overlay=1&bg=transparent and control it through Interact, but its saved splits live in OBS's own browser storage, so import your .lss there.

How accurate is the timer?

Elapsed time is derived from the browser's monotonic performance.now() clock and displayed to hundredths of a second. Browser privacy settings may reduce clock resolution, background tabs can update less often, and this tool is not frame-timed or suitable for categories that require an official game-time method.

Are my personal bests and attempts saved?

Yes. PB split times, best segments, attempts and completed runs are stored per game, category and split list in this browser's localStorage, and the last used run reloads automatically. They do not sync between devices, so export a .lss file to move them. Clear Saved Personal Bests removes every saved run.

Which keyboard shortcuts are supported?

Space splits (and starts a run in overlay mode), U or Backspace undoes the last split, K skips the current split, P pauses or resumes, R resets the attempt, O opens or closes the overlay and Esc leaves it. Shortcuts work while this browser tab is focused and not while you type in a text field.

Does an abandoned run overwrite my gold splits?

No. New best segments and PB times are committed only after every split of the run is completed, so resetting, skipping or editing an attempt does not overwrite saved records. The attempt itself is still counted.

What happens if I reload the page mid-run?

The active run is lost because the timer is entirely client-side, but your saved personal bests remain intact in localStorage.

How do I add or change splits?

Click "Edit Splits" to return to the setup panel. A different game, category or split list is saved as a separate run, and earlier runs stay available in the Saved runs list.

What is a gold split?

A gold split is a segment you just ran faster than your previous best for that segment. The row and its delta turn gold, and the new best segment is saved when the run is completed.

Speedrun Timer

A free browser speedrun timer with splits, live PB deltas, gold segments, Sum of Best, attempt counts, LiveSplit .lss import/export and an OBS overlay.

A speed run timer is a stopwatch that records a split each time you finish a segment, showing each segment time, the running total and whether you are ahead or behind your personal best.

Game

Split Names

One split per line. Leave blank to use defaults.

No saved attempts for this run yet.

Import .lss

Splits

Gold split Ahead of PB Behind PB

Split

Segment

Best Seg

Total / PB

+/- PB

Add split names on the left and start a run.

Personal best

—

Sum of best

—

Possible time save

—

Best possible time

—

Previous segment

—

Attempts (completed)

—

Hotkeys

Space split (starts a run in overlay) U/⌫ undo K skip P pause R reset O overlay Esc leave overlay

Stream overlay setup (OBS)

Click Overlay / OBS Mode and pick a background: Green or Magenta for chroma key (Magenta keeps green deltas visible), Dark for plain capture.
In OBS add a Window Capture of this browser window and crop it to the timer column.
Right-click the source, open Filters, add Chroma Key and set the key color to match the background.
Keep the browser window focused while you play, or split with a second device: web pages cannot read global hotkeys.
Alternative: add a Browser Source with https://top10k.com/tool/speedrun-timer?overlay=1&bg=transparent and control it with Interact. OBS keeps its own storage, so import your .lss inside it.

Timing runs locally in this tab. Saved profiles use this browser's localStorage; no split names or times are uploaded, and imported .lss files are read in the browser. The monotonic clock continues to determine elapsed time even if visual repaint updates are throttled in a background tab.

References: MDN performance.now(), LiveSplit (.lss format) and Speedrun.com submission guidance. For leaderboard submissions, follow the category's official start, end and timing-method rules.

Speedrun

0:00.00

Previous segment— Best possible time— Personal best—

Quick answer

A speed run timer is a stopwatch that records a split each time you finish a segment, showing each segment time, the running total and whether you are ahead or behind your personal best. This one runs free in your browser: press Space to split.

Example: Segments of 1:05.20, 2:10.45 and 0:58.30 give a run total of 4:13.95. If your best for segment 2 was 2:12.00, the 2:10.45 is a gold split.

Split with Space, beat your PB segment by segment and export a CSV.

Summary

A browser-based speedrun timer: name your splits (or import a LiveSplit .lss file), split with Space and see live ahead/behind deltas, gold segments, Sum of Best and Best Possible Time as you run. Attempts, personal bests and best segments are saved per game and category in your browser, with no account. A full-screen overlay mode with a chroma-key or transparent background puts the splits on your stream through OBS.

How it works

Enter the game, category and one split name per line, pick a saved run, or import a LiveSplit .lss file.
Click "Start Run" and press Space (or the Split button) each time you finish a segment.
Use U to undo a mistaken split, K to skip a checkpoint, P to pause and R to reset.
The delta column compares your running total with your personal-best split: green is ahead, red is behind, and the brighter shade means you are gaining or losing time on that segment.
A gold split marks a segment faster than your best ever; Sum of Best adds up all your best segments.
Best Possible Time updates live: your current time plus your best segments for everything left.
Open Overlay mode (O) for a full-screen timer with a dark, green, magenta or transparent background for OBS.
Finished runs update your PB and gold segments; export the run as CSV or the whole splits file as LiveSplit .lss.

Use cases

Time any game speedrun with hundredth-of-a-second display.
Track personal bests and gold segments per game and category.
Find where time is lost: compare your PB with your Sum of Best to see the possible time save.
Keep using your LiveSplit splits on a PC, laptop or phone where LiveSplit is not installed.
Show splits and the timer on stream with an OBS window capture or browser source.
Count attempts and completed runs for a category.
Export the completed run and segment results as a CSV file.

Frequently Asked Questions

Last updated: 2026-10-09 · Reviewed by Nham Vu