Annotation · datasets · fine-tuning · models · developer tools

The ML odd jobs, done in the tab.

Label a folder of images, split a dataset, check what your fine-tune will need in VRAM, read an ONNX file, count tokens, fix a JSON file. 36 tools, each one a page you can bookmark, all running in your browser with nothing uploaded.

Start labelling Browse the 36 tools

Files never leave your device YOLO · COCO · VOC · PaddleOCR · JSONL Free, no account

Every tool, one workbench

Pick the job.

Each tool opens with its controls on the left and the work on the right, saves your progress in the browser, and exports the file the next step expects.

Annotation

6 tools · Bounding boxes, polygons, OCR text, image classes, text classes and entity spans, exported in the formats training code expects.

Bounding Box AnnotatorDraw, move and resize boxes on a folder of images and export YOLO, COCO, Pascal VOC or CSV labels.Polygon & Segmentation AnnotatorTrace polygons for instance segmentation and export COCO segmentation or YOLO-seg labels.OCR Text AnnotatorDraw text boxes, type or auto-suggest the transcription, and export PaddleOCR, ICDAR or recognition-crop datasets.Image Classification LabelerAssign one class per image with the keyboard, then export a CSV or a class-folder zip.Text Classification LabelerLabel rows of text with keyboard shortcuts and export CSV or JSONL for a classifier.Entity (NER) Span AnnotatorSelect spans in text, tag them with entity types, and export spaCy or BIO token labels.

Datasets

8 tools · Split, convert, inspect, validate, de-duplicate and augment datasets, and assemble chat datasets for LLM fine-tuning.

Train / Validation / Test SplitterSplit images with labels, class folders, or CSV/JSONL rows into train, val and test with a fixed seed and stratification.Label Format ConverterConvert detection labels between YOLO, COCO, Pascal VOC and CSV without losing a box.Dataset StatisticsClass counts, box sizes, aspect ratios and image sizes for a labelled dataset, drawn as charts.Dataset ValidatorFind missing labels, empty files, bad class ids, out-of-bounds boxes and unreadable images before a training run fails.Duplicate Image FinderFind exact and near-duplicate images with perceptual hashing and remove them from a dataset.Batch Resize & AugmentResize, letterbox, flip, rotate and adjust a folder of images in the browser, with YOLO labels transformed to match.LLM Fine-tuning Dataset BuilderAssemble chat and instruction examples, validate them, count tokens and export OpenAI, Alpaca or ShareGPT JSONL.JSONL Viewer & ValidatorOpen large JSONL files, see the schema and statistics, find bad lines and duplicates, filter and convert to CSV.

Fine-tuning

7 tools · VRAM, time and cost before you start, a runnable script for YOLO, LoRA or a classifier, and the metrics afterwards.

GPU Memory (VRAM) CalculatorEstimate the GPU memory a fine-tune or inference run needs from parameters, precision, LoRA, batch size and sequence length.Fine-tuning Script GeneratorGenerate a runnable training script and config for YOLO detection, Hugging Face LoRA SFT, or an image classifier from your paths and settings.Training Time & Cost EstimatorEstimate hours and cloud cost from dataset size, epochs, throughput and GPU price, for LLM and vision runs.Learning Rate Schedule VisualizerPlot cosine, linear, step and one-cycle schedules with warmup over your step count and export the values.Model Size & Quantization CalculatorFile size and inference memory for a model at fp32, fp16, int8, int4 and GGUF quantisation levels, plus KV cache per token.Classification Metrics & Confusion MatrixPaste true and predicted labels and get accuracy, precision, recall, F1 per class, macro and weighted averages, and a confusion matrix.mAP Calculator for Object DetectionCompute AP per class and mAP@0.5 and mAP@0.5:0.95 from ground-truth and prediction files in YOLO or COCO format.

Models

3 tools · Read an ONNX file, count tokens, and turn a conversation into the exact prompt format a model was trained on.

ONNX Model InspectorOpen an ONNX file and see inputs, outputs, shapes, operator counts, initializer sizes and metadata, without installing anything.Tokenizer PlaygroundSee how text splits into tokens for GPT-style tokenizers, count tokens for a file, and estimate API cost.Chat Template ConverterTurn a system/user/assistant conversation into the exact prompt string a model was trained on: ChatML, Llama 3, Mistral, Gemma, Alpaca or Vicuna.

Developer

12 tools · JSON, YAML, TOML, CSV, schemas, regex, diffs, hashes, cron, timestamps, .env and Markdown, done in the tab, not on a server.

JSON Formatter, Validator & Tree ViewerFormat, validate, minify and explore JSON as a collapsible tree, with a path query and error positions.YAML, JSON & TOML ConverterConvert between YAML, JSON and TOML with validation, and see exactly where a config file breaks.CSV, JSON & JSONL ConverterConvert CSV to JSON or JSONL and back, with delimiter detection, type inference, column statistics and a preview table.JSON Schema Generator & ValidatorGenerate a JSON Schema from sample data and validate documents against a schema with precise error paths.Regex TesterTest regular expressions against text with live highlighting, group capture, replacement preview and a flag guide.Diff CheckerCompare two texts, JSON documents or config files line by line or word by word, side by side or inline.Encoders, Hashes & IDsBase64, URL and hex encoding, JWT decoding, MD5, SHA-1, SHA-256 and SHA-512 hashes, and UUID or ULID generation.Cron Expression BuilderBuild or explain a cron expression, see the next run times in your timezone and in UTC, and copy crontab or Kubernetes lines.Timestamp & Timezone ConverterConvert Unix seconds and milliseconds, ISO 8601 and human dates between UTC, IST and any timezone, and compute durations..env, JSON & Compose Environment ConverterConvert between .env files, JSON objects, docker-compose environment lists, Kubernetes ConfigMaps and shell exports.Markdown Editor & PreviewWrite Markdown with a live preview, tables and code highlighting, and export clean HTML or a model card.Image Inspector, EXIF & Base64Read an image's dimensions, format, EXIF and orientation, strip metadata, and convert to and from Base64 data URLs.

Why it works this way

Private by construction

Annotation, hashing, parsing and conversion run in the page. There is no upload endpoint on this site, which is also why it is free and has no account.

The file the next step wants

Exports are the exact layouts training code reads: YOLO folders with data.yaml, COCO JSON, PaddleOCR Label.txt, TRL chat JSONL, ImageFolder zips. No reformatting script in between.

Honest about the GPU

Training runs on your machine or your cloud. The tools here plan it (VRAM, time, cost, schedule), prepare it (data, script, config) and evaluate it (confusion matrix, mAP).