121 WINS / 0 LOSSES

Best JSONL / NDJSON Compression Tool

Up to 99% smaller than LZMA. 121 wins, 0 losses across real-world JSONL / NDJSON files. Lossless, verified, free to try.

Compress JSONL / NDJSON Free Full Benchmarks
99%
Best Saving vs LZMA
94.3%
Median Saving
121W / 0T
Win / Tie Record
0
Losses

How PZIP Compresses JSONL / NDJSON

PZIP parses every line, extracts the schema, stores keys exactly once in a dictionary, then columnarizes all values by key. Each column type — timestamps, numbers, strings — gets specialized compression. The result: up to 88.8% smaller than treating JSONL as flat text.

Codec: Columnar codec
Lossless
Byte-exact round-trip verified on every file
Never-Worse
Falls back to LZMA if it can't beat it
Automatic
Type detection + codec selection is automatic

History of JSONL / NDJSON

Est. 2013Created by Ian Ward

JSONL (JSON Lines) was formalized by Ian Ward as a convention for streaming and storing structured records — one JSON object per line. Also known as NDJSON (Newline Delimited JSON), it became the standard for data pipelines, log aggregation, and machine learning datasets.

Compression Timeline

2001

JSON created by Douglas Crockford

2013

JSONL convention formalized by Ian Ward

2015

NDJSON specification published

2020

JSONL becomes standard for ML datasets and log pipelines

2026

PZIP achieves 88.8% savings vs LZMA with columnar JSONL codec

Real-World Benchmark Results

Every file tested with LZMA-9 (maximum compression) as baseline. Round-trip correctness verified on every file.

FileSizePZIP vs LZMAResultDownload
csv2jsonl_Classifications.jsonl1.5 MB
-99%
WIN Source
fivethirtyeight_bob_ross.jsonl466.0 KB
-98.8%
WIN Source
r_count_affairs.jsonl180.1 KB
-98.8%
WIN Source
tidytuesday_freedom.jsonl683.8 KB
-98.8%
WIN Source
vega_birdstrikes.jsonl4.1 MB
-98.5%
WIN Source
csv2jsonl_Geography.jsonl2.2 MB
-98.3%
WIN Source
seaborn_titanic.jsonl221.8 KB
-98.2%
WIN Source
worldbank_life_expectancy.jsonl1.5 MB
-97.9%
WIN Source
tidytuesday_womens_soccer.jsonl71.1 KB
-97.7%
WIN Source
worldbank_population.jsonl1.4 MB
-97.7%
WIN Source
r_aer_affairs.jsonl108.2 KB
-97.6%
WIN Source
tidytuesday_frogs.jsonl111.3 KB
-97.3%
WIN Source
ecb_exchange_rates.jsonl3.3 MB
-97.1%
WIN Source
fivethirtyeight_congress_age.jsonl4.6 MB
-97.1%
WIN Source
tidytuesday_ninja_warrior.jsonl122.0 KB
-97.1%
WIN Source
tidytuesday_plastics.jsonl3.0 MB
-97.1%
WIN Source
nytimes_covid_states.jsonl4.1 MB
-97%
WIN Source
r_survival_colon.jsonl452.2 KB
-97%
WIN Source
tidytuesday_dog_breeds.jsonl89.9 KB
-96.9%
WIN Source
vega_weather.jsonl409.6 KB
-96.9%
WIN Source
tidytuesday_palmer_penguins.jsonl59.1 KB
-96.8%
WIN Source
seaborn_penguins.jsonl53.7 KB
-96.7%
WIN Source
tidytuesday_scooby.jsonl1.1 MB
-96.7%
WIN Source
tidytuesday_eruptions.jsonl4.1 MB
-96.6%
WIN Source
tidytuesday_squirrels.jsonl2.8 MB
-96.5%
WIN Source
r_wooldridge_wage1.jsonl214.3 KB
-96.4%
WIN Source
r_datasets_infert.jsonl39.1 KB
-96.3%
WIN Source
tidytuesday_cocktails.jsonl780.5 KB
-96.3%
WIN Source
tidytuesday_penguins_raw.jsonl157.1 KB
-96.3%
WIN Source
vega_seattle_weather.jsonl171.2 KB
-96.3%
WIN Source
gold_prices.jsonl88.8 KB
-96.2%
WIN Source
ml_wine_white.jsonl1.3 MB
-96.2%
WIN Source
vega_unemployment_industries.jsonl199.6 KB
-96.2%
WIN Source
ml_wine_red.jsonl424.0 KB
-96.1%
WIN Source
worldbank_gdp_percapita.jsonl1.5 MB
-96.1%
WIN Source
seaborn_taxis.jsonl2.1 MB
-96%
WIN Source
tidytuesday_beyonce_taylor.jsonl3.9 MB
-96%
WIN Source
plotly_tips.jsonl27.5 KB
-95.9%
WIN Source
r_ggplot_mpg.jsonl46.3 KB
-95.9%
WIN Source
tidytuesday_star_trek.jsonl649.4 KB
-95.9%
WIN Source
tidytuesday_coffee.jsonl1.6 MB
-95.8%
WIN Source
tidytuesday_marble_races.jsonl78.3 KB
-95.8%
WIN Source
tidytuesday_tbi.jsonl32.3 KB
-95.6%
WIN Source
fivethirtyeight_bad_drivers.jsonl29.3 KB
-95.5%
WIN Source
tidytuesday_astronaut.jsonl776.8 KB
-95.5%
WIN Source
tidytuesday_volcano.jsonl754.1 KB
-95.5%
WIN Source
global_temp.jsonl212.6 KB
-95.2%
WIN Source
r_reshape_tips.jsonl31.7 KB
-95.2%
WIN Source
tidytuesday_christmas_songs.jsonl137.4 KB
-95.2%
WIN Source
fivethirtyeight_comic_marvel.jsonl4.9 MB
-95.1%
WIN Source
population.jsonl1.5 MB
-95.1%
WIN Source
r_mass_birthwt.jsonl27.0 KB
-95.1%
WIN Source
tidytuesday_passwords.jsonl92.9 KB
-95.1%
WIN Source
r_datasets_chickweight.jsonl43.9 KB
-95%
WIN Source
vega_flights_20k.jsonl1.9 MB
-94.8%
WIN Source
natural_gas.jsonl284.5 KB
-94.6%
WIN Source
tidytuesday_ikea.jsonl1.5 MB
-94.6%
WIN Source
vega_flights_10k.jsonl959.4 KB
-94.6%
WIN Source
vega_flights_airport.jsonl294.6 KB
-94.5%
WIN Source
vega_disasters.jsonl48.2 KB
-94.3%
WIN Source
vega_flights_5k.jsonl479.7 KB
-94.3%
WIN Source
tidytuesday_food_consumption.jsonl152.9 KB
-94.2%
WIN Source
seaborn_planets.jsonl121.3 KB
-94.1%
WIN Source
vega_movies.jsonl1.3 MB
-94%
WIN Source
fivethirtyeight_daily_show.jsonl355.0 KB
-93.9%
WIN Source
vega_cars.jsonl76.7 KB
-93.9%
WIN Source
usgs_earthquakes_week.jsonl1.4 MB
-93.8%
WIN Source
r_ggplot_txhousing.jsonl1.6 MB
-93.7%
WIN Source
tidytuesday_cran_packages.jsonl4.1 MB
-93.7%
WIN Source
tidytuesday_tuition.jsonl786.5 KB
-93.7%
WIN Source
tidytuesday_media_franchises.jsonl73.4 KB
-93.6%
WIN Source
vega_flights_2k.jsonl191.9 KB
-93.6%
WIN Source
tidytuesday_beer_awards.jsonl873.1 KB
-93.5%
WIN Source
tidytuesday_ramen.jsonl455.2 KB
-93.4%
WIN Source
r_datasets_treering.jsonl430.3 KB
-93.3%
WIN Source
vega_co2_concentration.jsonl47.8 KB
-93.3%
WIN Source
seaborn_dots.jsonl83.9 KB
-93.1%
WIN Source
vega_countries.jsonl96.5 KB
-93.1%
WIN Source
r_survival_pbc.jsonl137.3 KB
-92.6%
WIN Source
s_and_p_500.jsonl426.6 KB
-92.3%
WIN Source
fivethirtyeight_avengers.jsonl83.0 KB
-91.9%
WIN Source
world_cities.jsonl3.1 MB
-91.9%
WIN Source
r_mass_crabs.jsonl24.6 KB
-91.8%
WIN Source
country_codes.jsonl438.1 KB
-91.7%
WIN Source
csv2jsonl_Cxx17Issues.jsonl95.2 KB
-91.6%
WIN Source
seaborn_dowjones.jsonl26.3 KB
-91.5%
WIN Source
vega_population.jsonl30.4 KB
-91.4%
WIN Source
fivethirtyeight_hate_crimes.jsonl21.2 KB
-91.3%
WIN Source
vega_gapminder.jsonl72.8 KB
-91.3%
WIN Source
csv2jsonl_Cxx23Issues.jsonl94.4 KB
-91.2%
WIN Source
r_mass_boston.jsonl118.2 KB
-91%
WIN Source
csv2jsonl_Cxx20Issues.jsonl93.4 KB
-90.9%
WIN Source
plotly_gapminder.jsonl279.5 KB
-90.9%
WIN Source
currency_codes.jsonl63.4 KB
-90.6%
WIN Source
r_ggplot_economics.jsonl74.1 KB
-90.6%
WIN Source
csv2jsonl_Cxx2cIssues.jsonl78.9 KB
-90.5%
WIN Source
csv2jsonl_Cxx2cPapers.jsonl50.3 KB
-90.4%
WIN Source
fivethirtyeight_bechdel.jsonl600.3 KB
-90.4%
WIN Source
r_dplyr_starwars.jsonl20.5 KB
-90%
WIN Source
tidytuesday_moore_law.jsonl27.5 KB
-90%
WIN Source
tidytuesday_simpsons.jsonl186.4 KB
-89.8%
WIN Source
tidytuesday_wheels.jsonl41.0 KB
-89.6%
WIN Source
tidytuesday_transit_cost.jsonl250.3 KB
-89.5%
WIN Source
plotly_gapminderdata.jsonl216.4 KB
-89.4%
WIN Source
tidytuesday_the_office.jsonl23.7 KB
-89.4%
WIN Source
plotly_apple_finance.jsonl136.8 KB
-88.5%
WIN Source
tidytuesday_bechdel.jsonl1.8 MB
-88.3%
WIN Source
vega_airports.jsonl505.4 KB
-87.8%
WIN Source
language_codes.jsonl50.0 KB
-87.1%
WIN Source
fivethirtyeight_riddler.jsonl646.0 KB
-86.3%
WIN Source
r_ggplot_midwest.jsonl304.6 KB
-86.1%
WIN Source
tidytuesday_solar.jsonl26.3 KB
-85.5%
WIN Source
tidytuesday_product_hunt.jsonl2.6 MB
-85.1%
WIN Source
plotly_us_cities.jsonl112.2 KB
-84.7%
WIN Source
tidytuesday_solar_wind.jsonl26.0 KB
-84.7%
WIN Source
fivethirtyeight_nba_raptor.jsonl3.1 MB
-84.4%
WIN Source
plotly_flights_2k.jsonl35.7 KB
-83.6%
WIN Source
r_wooldridge_hprice1.jsonl22.1 KB
-82.4%
WIN Source
tidytuesday_horror_movies.jsonl2.5 MB
-81.4%
WIN Source
seaborn_brain_networks.jsonl434.1 KB
-75.2%
WIN Source
vega_normal_2d.jsonl26.3 KB
-69.7%
WIN Source

Frequently Asked Questions

How much smaller does PZIP make JSONL files?

+

Up to 88.8% smaller than LZMA-9. Our 117-file benchmark shows 30.8% median savings across real-world JSONL datasets including sensor data, event logs, and API logs.

Does PZIP handle nested JSON objects in JSONL?

+

Currently, nested objects fall back to LZMA compression. Flat schemas with consistent keys see the biggest columnar wins.

Is PZIP good for compressing data pipeline output?

+

Excellent. JSONL is the standard for data pipelines, and PZIP's columnar approach was specifically designed for this use case. Streaming logs, metrics, events — all benefit.

PZIP vs Other Compressors for JSONL / NDJSON

FeaturePZIPLZMA / xzgzipzstd
Type-AwareYesNoNoNo
LosslessYesYesYesYes
Never-Worse GuaranteeYesN/AN/AN/A
Best JSONL / NDJSON Saving99%BaselineWorse~Similar
Round-Trip VerifiedEvery fileManualManualManual

Try PZIP on Your JSONL / NDJSON Files

Upload any JSONL / NDJSON file up to 30 MB. Free during beta — no signup required. See how much smaller PZIP makes it.

Compress JSONL / NDJSON Now All File Types
Baseline:     LZMA-9 (maximum compression)
Competitors:  gzip-9, bz2-9, brotli-11, zstd-19, PPMd 2-24
Verification: Byte-exact round-trip on every file
Guarantee:    Never-worse (PZIP <= LZMA, always)
Test files:   121 real-world JSONL / NDJSON files
Updated:      2026-02-15