ZERO-UPLOAD SANDBOX · 100% Client-Side File.slice() + Web Workers · Works in Airplane Mode

/llms.txt /api/v1/magic-bytes.json

Inspect Local File →

100% In-Browser File.slice() · 29 Compiler-Verified Specs · 87 SHA-256 QA Fixtures

X-Ray Any Binary File Locally.
Zero Upload. Instant Schema.

Drop a 70 GB .gguf model, a 20 GB .parquet dataset, a sensitive .sqlite / .har dump, or a corrupted .xlsx download. Our paged header/footer reader decodes internal schemas & magic bytes in <20ms without uploading a single byte.

0xFF

Drop any local file (1 KB to 100 GB+) to inspect binary headers & schema

Reads tiny File.slice() header/footer pages in a sandboxed Web Worker · 0 Bytes Uploaded

01 · Paged Blob.slice() Engine

Instant 100 GB+ File Inspection

Unlike naive hex viewers that crash browser RAM or cloud tools that demand uploads, our adaptive cursor slices only dynamic header & footer pages (GGUF KV tables, SafeTensors JSON, Parquet Thrift footers, ZIP EOCD).

02 · Container Disambiguation

Catch Spoofed & Broken Files

Distinguishes .xlsx, .ipa, .aab, .npz, .usdz and PyTorch .pt inside shared ZIP headers—and flags API gateway HTML errors saved with binary extensions.

03 · Deterministic QA Fixtures

Edge-Case Samples + SHA-256

Grab 1 KB unit-test stubs, UTF-8 BOM multiline CSVs, EXIF Orientation=6 JPEGs, multi-column RAG PDFs, and truncated footers via immutable curl links.

Compiler-Verified Binary Atlas

Explore Modern High-Value File Specifications

Browse all 87 QA sample fixtures →

AI & Model Weights

Inspect 70GB+ tensor weights, quantization KV metadata & pickle safety locally

View quadrant (7) →

.gguf Deep AST

GGUF

Self-contained binary model weight format for llama.cpp and local LLM inference engines, storing architecture KV metadata, BPE vocabulary, and quantized tensor blocks in a single mmap-ready file.

0x0: 47 47 55 46

Spec · Samples

.jsonl Deep AST

JSONL

Streaming line-oriented text format where every newline-separated record is a standalone UTF-8 JSON value—standard for LLM fine-tuning (SFT/DPO) datasets and batch APIs.

endian: text

Spec · Samples

.npy Deep AST

NPY

Simple, mmap-friendly binary representation of a single homogeneous dense tensor with an explicit ASCII header dictionary describing dtype, byte order, and shape.

0x0: 93 4E 55 4D

Spec · Samples

.npz Deep AST

NPZ

ZIP container bundling multiple named NumPy `.npy` tensor arrays, widely used for embeddings, calibration datasets, and JAX/MLX checkpoints.

0x0: 50 4B 03 04

Spec · Samples

.pt Deep AST

PyTorch PT

Default PyTorch `torch.save()` archive wrapping a Python Pickle instruction stream (`data.pkl`) alongside raw tensor storage files inside a ZIP container.

0x0: 50 4B 03 04

Spec · Samples

.safetensors Deep AST

SafeTensors

Hugging Face's memory-safe, zero-copy tensor serialization format designed to replace Pickle-based PyTorch checkpoints without arbitrary code execution risks.

0x0: 7B 22

Spec · Samples

.onnx Hex Map

ONNX

Cross-framework Protocol Buffers computation graph and weight format used by ONNX Runtime, TensorRT, and CoreML converters.

0x0: 08

Spec · Samples

Data Engineering & Columnar

Decode Parquet Thrift footers, SQLite schemas, Arrow IPC & Avro headers offline

View quadrant (8) →

.arrow Deep AST

Arrow IPC

Zero-copy in-memory columnar format serialized to disk with 8-byte aligned `ARROW1\x00\x00` framing and FlatBuffers schema/record-batch descriptors.

0x0: 41 52 52 4F

Spec · Samples

.avro Deep AST

Avro

Row-oriented binary data serialization container widely used in Kafka/Confluent event streaming and Iceberg manifest lists, embedding full JSON writer schema in the file header.

0x0: 4F 62 6A 01

Spec · Samples

.csv Deep AST

CSV

Plain-text tabular interchange format notorious for real-world parser edge cases: optional UTF-8 BOMs (`EF BB BF`), multiline quoted cells, doubled quote escapes (`""`), and formula injection.

endian: text

Spec · Samples

.feather Deep AST

Feather v2

Fast, language-agnostic DataFrame persistence format for Python (Pandas/Polars) and R, standardized since v2 directly atop the Apache Arrow IPC file specification.

0x0: 41 52 52 4F

Spec · Samples

.parquet Deep AST

Parquet

De-facto standard hybrid columnar storage format for modern data lakes (Iceberg, Delta, DuckDB, Spark), placing Thrift Compact Protocol schema and statistics in the file trailer.

0x0: 50 41 52 31

Spec · Samples

.sqlite Deep AST

SQLite 3

Ubiquitous single-file ACID relational B-tree database with a big-endian 100-byte header at offset 0x00 and full SQL DDL catalog stored in Root Page 1 (`sqlite_schema`).

0x0: 53 51 4C 69

Spec · Samples

.duckdb Hex Map

DuckDB

Single-file vectorized OLAP database format storing compressed columnar row-groups in 4 KB / 256 KB block-managed pages.

0x0: 44 55 43 4B

Spec · Samples

.orc Hex Map

Apache ORC

Stripe-based columnar storage format originating in the Hive/Trino/Presto ecosystem with Protobuf-encoded Footer and a 1-byte PostScript length at the very last byte of the file.

0x0: 4F 52 43

Spec · Samples

Modern Media & Spatial 3D

Verify ISOBMFF brands, EXIF rotation traps, AI PNG prompts & glTF/USDZ scenes

View quadrant (7) →

.avif Deep AST

AVIF

Royalty-free HDR & wide-gamut next-gen web image format wrapping AV1 keyframes inside an ISO Base Media (`ftyp`) container (`major_brand` = `avif` or `avis`).

0x0: 66 74 79 70

Spec · Samples

.glb Deep AST

glTF GLB

Khronos Group's single-file binary 3D delivery format combining a 12-byte header, a UTF-8 JSON scene-graph chunk (`0x4E4F534A`), and a raw GPU geometry/texture buffer (`0x004E4942`).

0x0: 67 6C 54 46

Spec · Samples

.heic Deep AST

HEIC

Apple iOS default camera photo container encapsulating HEVC (H.265) intra-coded image tiles, depth maps, and EXIF metadata inside an ISO Base Media (`ftyp`) box hierarchy.

0x0: 66 74 79 70

Spec · Samples

.jpg Deep AST

JPEG

Marker-segmented DCT lossy image format (`FF D8 FF ... FF D9`), where embedded APP1 EXIF TIFF headers carry camera rotation flags (`Orientation=6`) and GPS coordinates.

0x0: FF D8 FF

Spec · Samples

.png Deep AST

PNG

Lossless CRC-checked chunked raster image format, heavily used in AI workflows (ComfyUI / Stable Diffusion) to store generation graphs and prompts inside `tEXt`/`iTXt` chunks.

0x0: 89 50 4E 47

Spec · Samples

.usdz Deep AST

USDZ

Zero-compression, 64-byte mmap-aligned PKZIP package created by Pixar & Apple for AR QuickLook and VisionOS spatial scenes, beginning with a root `.usdc` (`PXR-USDC`) or `.usda` stage.

0x0: 50 4B 03 04

Spec · Samples

.webp Deep AST

WebP

RIFF-based modern raster image container supporting lossy (`VP8 `), lossless (`VP8L`), and extended alpha/animated/EXIF (`VP8X`) bitstreams.

0x0: 52 49 46 46

Spec · Samples

DevTools, Captures & Bundles

Audit WASM sections, sanitize HAR captures, dissect mobile bundles & detect spoofed files

View quadrant (7) →

.aab Deep AST

Android AAB

Google Play publishing format packaging `BundleConfig.pb`, Protocol-Buffer encoded `base/manifest/AndroidManifest.xml`, and DEX bytecode inside a modular ZIP container.

0x0: 50 4B 03 04

Spec · Samples

.har Deep AST

HAR

UTF-8 JSON network session capture exported by Chrome/Firefox/Playwright containing full HTTP headers, cookies, request payloads, and timing waterfalls.

endian: text

Spec · Samples

.ipa Deep AST

iOS IPA

ZIP-compressed iOS/iPadOS application distribution archive structured around `Payload/<AppName>.app/Info.plist` (`bplist00`) and Mach-O ARM64 binaries.

0x0: 50 4B 03 04

Spec · Samples

.pcap Deep AST

PCAP

Classic 24-byte header packet capture format produced by `tcpdump` and Wireshark, encoding host endianness and timestamp precision directly in its 4-byte magic number.

0x0: D4 C3 B2 A1

Spec · Samples

.pdf Deep AST

PDF

Object-graph document format parsed bottom-up from its trailing `startxref` and `%%EOF` markers—primary battleground for AI RAG table extraction and active `/JavaScript` upload sanitization.

0x0: 25 50 44 46

Spec · Samples

.wasm Deep AST

WASM

Portable, sandboxed stack-machine binary bytecode format (`\0asm` v1) structured as a sequence of LEB128-framed Type, Import, Function, Memory, Export, and Code sections.

0x0: 00 61 73 6D

Spec · Samples

.xlsx Deep AST

XLSX

ZIP-packaged XML spreadsheet container (`[Content_Types].xml` + `xl/workbook.xml`). Frequently misdiagnosed when backend export endpoints fail and save HTML/JSON error pages as `.xlsx`.

0x0: 50 4B 03 04

Spec · Samples

For Engineering & AI Platform Teams

QA Upload Security & AI RAG Parser Torture Suite

Benchmarking Docling, Marker, LlamaParse, or hardening your SaaS file upload gateway? Get 500+ curated edge-case files—multi-column cross-page financial PDFs with 100% human-verified Ground-Truth Markdown/JSON outputs, benign polyglot headers, encoding edge-cases, and automated pytest / vitest runners.

Explore Free QA Fixtures → Try Local HAR Sanitizer