Download Accelerator

Download Accelerator speeds up your downloads by splitting files into multiple parts and fetching them simultaneously over parallel connections — similar to IDM or JDownloader, built right into Chrome.

KEY FEATURES

• Parallel connections — split each file into up to 16 simultaneous connections per download
• Multiple concurrent downloads — run several downloads at the same time
• Pause & resume — stop and continue any download without losing progress
• Real-time progress — per-connection speed lanes, live transfer speed and ETA
• Right-click download — "Download with Download Accelerator" on any link
• Intercept mode — optionally capture all browser downloads automatically
• Custom download folder — choose where files are saved

TWO MODES

Browser Mode works out of the box — no installation required. Downloads are handled directly in the browser using parallel Range requests.

Native Mode (optional) unlocks the full potential: a small native helper app opens true parallel TCP connections over HTTP/1.1, bypassing Chrome's HTTP/2 multiplexing for maximum speed. Supports authenticated downloads by forwarding session cookies. Install it once with a single script on macOS or Windows.

OPEN SOURCE

Full source code available on GitHub:
https://github.com/zettifour/download-accelerator

PRIVACY

No data is collected, stored remotely, or shared. All settings are saved locally on your device only.

VERSION 1.1.0

• macOS native host rewritten in Swift — single lightweight binary, no Python runtime required. Installs reliably on all Macs.
• Fixed: max concurrent downloads setting is now enforced correctly.
• Fixed: browser mode no longer crashes at the end of a download.
• Improved: download queue with "Queued" status shown in the popup.
• Improved: welcome page shown on first install with pin and setup instructions.