BoltView — A free image viewer built to be the fastest

BoltView 2.0.4

Free · Windows image viewer · Installer · Portable

Already open when you click,
and the next photo shows instantly

BoltView is a Windows image viewer built from scratch with one goal: speed. It decodes the photos before and after the one you are viewing in advance and lets the graphics card handle screen transitions, so a photo that has been loaded once flips in a single frame (about 16ms). Finding photos by name, viewing PDF and Excel files, and flipping through ZIP archives all fit in an executable of about 1MB.

Free · No adsInstaller · PortableWindows 10 / 11한국어 · English · 日本語 · 中文

16ms

Next photo transition

For cached photos

2~4×

Faster JPEG decoding

libjpeg-turbo SIMD

1MB

Program size

BoltView.exe

Price

No ads, no account

BoltView gallery start screen — folder tree and favorites on the left, photo thumbnail grid on the right (dark theme) — **Gallery start screen** — folder tree and favorites on the left, thumbnail grid on the right. Click a photo to open it full size instantly.

01 · WHY FAST

Why it's fast — it never decodes at the moment of display

Image viewers are slow not because of the time spent reading files, but because of the time spent decoding compressed JPEG and PNG data. BoltView is designed around a single principle: "never decode at the moment of display."

⏭️

Predecoding

Photos before and after the current one are decoded in the background. Next and previous flip with no waiting.

🖥️

GPU rendering (Direct2D)

The graphics card handles zoom and rotation, so screen transitions finish within one frame.

♻️

Memory cache

A photo you have already viewed is never decoded again.

⚡

libjpeg-turbo

Decodes JPEG 2–4× faster with SIMD.

Item

Typical viewer

BoltView

Next photo

Decodes every time you flip

Shows the predecoded photo instantly

Zoom · Rotate

Done on the CPU

Graphics card (Direct2D)

Viewing again

Decodes again every time

Straight from the cache

JPEG decoding

Standard decoder

libjpeg-turbo (SIMD)

Footprint

Heavy or needs a runtime

Single native exe, no runtime

※ "Typical viewer" refers to a common architecture, not a specific product; actual products vary.

02 · VIEWER

Viewing and file management — everything you need

BoltView viewer — filmstrip and toolbar at the bottom — **Filmstrip and toolbar** — flip through photos while seeing neighbors in the bottom strip, and rotate, zoom or delete from the toolbar.

BoltView info panel — file name, size, resolution, date taken — **Info panel** — overlay details such as file size, resolution and date on the photo.

🔍

Viewing

Fit, 100% and fill, cursor-centered wheel zoom, rotate and flip, EXIF auto-rotation, animated GIF.

🗂️

File operations

Delete to Recycle Bin (with confirmation), copy, save as (lossless JPEG rotation), set as desktop background, open file location.

🖼️

Gallery

Folder tree + thumbnails, pinned favorites and recent folders, multi-select with drag, Ctrl and Shift.

▶️

Slideshow · Filmstrip

Full keyboard shortcuts, high-DPI display support, fullscreen.

BoltView right-click menu — open, copy, rename, open location, delete and more — **Right-click menu** — even with the menu turned off, Shift + right-click opens the full menu (2.0.4). Right-clicking an image in File Explorer also shows "Open with BoltView".

03 · SEARCH

Find photos by name — even by Korean initial consonants

When you can't remember which folder you put something in, instead of waiting on Explorer search and then reopening the file in a viewer, you search by name inside BoltView and flip through the results right there.

ㄱ

Initial-consonant search

ㄱㅎㅍ → 김학필.jpg (Korean example: typing just the initial consonants of a name finds the file).

🎯

Only what you typed

No fuzzy "close enough" matches, so everything in the list is what you were looking for.

⌨️

Live while composing

Results update even while a Korean character is still being composed by the IME.

🌐

This folder · Whole PC

Switch the scope inside the app. Whole-PC search borrows the FastFind index.

BoltView search — typing image in the search box shows matching photos as thumbnails — **Search results** — found photos are shown in a grid; click one to open it full size and flip through.

Whole-PC search borrows FastFind's index. BoltView does not build an index of its own; if FastFind — a free file search tool by the same developer — is installed, it only reads that index. The viewer never crawls your disk in the background, and without FastFind it searches the current folder. (FastFind measured: first-query response of 5.3ms on an index of 4.66 million entries, index size 65.9MB)

04 · DOCUMENTS

Documents and archives in the same window

PDFs are rendered by BoltView itself rather than handed to the Windows preview. Open and flip through them just like photos.

Opens without Office

PDF · XLSX · CSV · text · JSON. No Excel or Word installation required.

Needs the associated program

DOCX · PPTX · Hangul (HWP) · legacy XLS. These go through the Windows preview, so the program that opens the file must be installed on the PC.

ZIP

Opens archives as-is without extracting and flips through them page by page. Handy for comics and scanned sets.

Image formats — JPEG · PNG · GIF (animated) · WebP · TIFF · BMP · ICO · HEIC (requires the Windows HEIF codec)

05 · THEMES

Four themes and four languages

Dark · Light · Black (OLED) · Night (sepia), plus follow-system. Menus are available in 한국어 · English · 日本語 · 中文.

BoltView light theme gallery — **Light** — for bright offices.

BoltView black (OLED) theme gallery — **Black (OLED)** — a pure black background.

BoltView night (sepia) theme gallery — **Night (sepia)** — warm tones that are easy on the eyes at night.

06 · UPDATE & SETTINGS

Auto-update only checks — you decide whether to download

Since 2.0.1, BoltView checks for new versions on its own. But it only checks.

1Checks once a day

20 seconds after the window opens, it checks just the version number, once a day.

2Notification only

If a new version exists, a notice appears at the bottom of the screen. Nothing is downloaded until you click it.

3SHA-256 verification

The file is replaced only if its hash matches; otherwise it is discarded.

4Restarts automatically

Once the update is applied, BoltView relaunches.

BoltView Settings › System — set as default image viewer, register file associations, run in background, quick search (FastFind), automatically check for new versions — **Settings › System** — set the default image viewer, create shortcuts, stay in the tray (quick launch), connect FastFind and manage auto-update in one place.

✓Nothing is sent to the server. It only downloads.

✓Turning it off in [Settings › Update] means the networking DLL is not even loaded.

✓With [Settings › System › Set as default image viewer], double-clicking a photo opens it in BoltView.

✓Enable running in the background (tray icon) to make the next launch even faster.

07 · SHORTCUTS

Key shortcuts

← / →Previous · Next

SpaceNext

WheelCursor-centered zoom

FFit to screen

F11Fullscreen

DelMove to Recycle Bin

EscBack to gallery · Close

Shift+Right-clickFull menu

08 · DOWNLOAD

Download

InstallerRecommendedAbout 2.6MB

BoltViewSetup-2.0.4.exe

✓Adds Start menu entry and shortcuts

✓Explorer "Open with BoltView"

✓Uninstall from Windows Settings › Apps

PortableRun from USBAbout 0.9MB

BoltView-2.0.4-portable.zip

✓Extract and run BoltView.exe

✓turbojpeg.dll stays in the same folder

✓To remove, delete the folder

OSWindows 10 / 11 64-bit

Built withC++17 · Win32 API (native), Direct2D · WIC · DirectWrite, libjpeg-turbo — a single executable with no external runtime

Languages한국어 · English · 日本語 · 中文

Official siteboltview.kbox.uk

PriceFree · No ads · No account

"Windows protected your PC" on first launch This notice appears because it is an independently developed program without a code-signing certificate. Click "More info" → "Run anyway". You can use the SHA-256 values below to confirm the downloaded file matches the original.

# PowerShell
Get-FileHash .\BoltViewSetup-2.0.4.exe -Algorithm SHA256
Get-FileHash .\BoltView-2.0.4-portable.zip -Algorithm SHA256

# Expected values (2.0.4)
# BoltViewSetup-2.0.4.exe
# 3472329b57c041f7052fffed73655244bfeb0330ed58362a3209dace82bc4682
#
# BoltView-2.0.4-portable.zip
# a16a8e6b6e49c6cf7062a66b867e0c0c38adc4df2dfd7198ee6f1edc9f7baa26

09 · FAQ

Frequently asked questions

I'm looking for a fast free image viewer — how fast is BoltView?

It decodes the photos before and after the current one in advance (predecoding), lets the graphics card (Direct2D) handle screen transitions, and reuses photos you have already viewed from a memory cache. As a result, cached photos flip within one frame (about 16ms), and JPEGs are decoded 2–4× faster with libjpeg-turbo.

Is BoltView free?

Yes, it is completely free. There are no ads and no sign-up, and both an installer and a portable version are provided.

Which image formats are supported?

JPEG, PNG, GIF (animated), WebP, TIFF, BMP, ICO and HEIC. HEIC requires the Windows HEIF codec.

Can it open PDF or Excel files too?

PDF, XLSX, CSV, text and JSON open without Office. PDFs are rendered by BoltView itself so you can flip through them like photos. DOCX, PPTX, Hangul (HWP) and legacy XLS go through the Windows preview, so the program that opens those files must be installed on the PC. ZIP archives can be flipped through page by page without extracting.

Can I find a photo if I don't remember which folder it's in?

Just type part of the name. It supports Korean initial-consonant search (typing ㄱㅎㅍ finds 김학필.jpg), and because it matches only exactly what you typed, everything in the list is what you were looking for.

Do I need FastFind to search for photos across my whole PC?

Whole-PC scope requires the FastFind index. BoltView does not build an index of its own; it only reads FastFind's index. Without FastFind, it searches within the folder you are currently viewing.

How do updates work?

Auto-update is supported since 2.0.1. Twenty seconds after the window opens, it checks just the version number once a day and only shows a notification if a new version is available. Nothing is downloaded until you click it, and a downloaded file is applied only if its SHA-256 matches. You can turn it off in [Settings › Update].

Can I set it as my default image viewer?

Set it in [Settings › System › Set as default image viewer]. Registering file associations, opening Windows default app settings, and creating desktop and Start menu shortcuts are in the same place.

Can I use it instead of Honeyview or the Windows Photos app?

If you mainly want to flip through photos quickly, yes. It has a gallery, slideshow, rotation with lossless save, an info panel and four themes, and the executable is a light ~1MB.

"Windows protected your PC" appears — is that OK?

This notice appears because it is an independently developed program without a code-signing certificate. Click "More info" → "Run anyway". You can first use the SHA-256 values on this page to confirm the downloaded file matches the original.

Windows is a trademark of Microsoft Corporation. Honeyview is a trademark of its respective owner and is not affiliated with BoltView.